diff --git a/server/dao/dao.go b/server/dao/dao.go
index e916766..e53acd1 100644
--- a/server/dao/dao.go
+++ b/server/dao/dao.go
@@ -1,6 +1,8 @@
 package dao
 
 import (
+	"io"
+	"log"
 	"time"
 
 	"github.com/spf13/viper"
@@ -12,10 +14,17 @@ import (
 
 var db *gorm.DB
 
-func InitDb() {
+func InitDb(logWriter io.Writer) {
 	var err error
 	db, err = gorm.Open(mysql.Open(viper.GetString("dsn")), &gorm.Config{
-		Logger: logger.Default.LogMode(logger.Info), // show basically all sql gorm generated for DEBUG
+		Logger: logger.New(
+			log.New(logWriter, "[GORM] ", log.LstdFlags|log.Llongfile|log.Lmicroseconds),
+			logger.Config{
+				SlowThreshold:             100 * time.Millisecond, // Slow SQL threshold
+				Colorful:                  viper.GetBool("enable_console_color"),
+				IgnoreRecordNotFoundError: false,       // Ignore ErrRecordNotFound error for logger
+				LogLevel:                  logger.Info, // show basically all sql gorm generated for DEBUG
+			}),
 	})
 	if err != nil {
 		panic(errors.Because(errors.New("initialization failed"), err, ""))
diff --git a/server/dao/exam_session.go b/server/dao/exam_session.go
index d400f27..1683a4e 100644
--- a/server/dao/exam_session.go
+++ b/server/dao/exam_session.go
@@ -459,7 +459,7 @@ func CalculateScores(examId int) {
 			if utils.IsAnagram(e.StudentAnswer, e.RightAnswer) { // 全选对得满分
 				sessionId2ScoreMap[e.ExamSessionID] += int(exam.MaqScore) * 10
 				statistics.overallCorrectScore += int(exam.MaqScore) * 10
-			} else if utils.Contains(e.RightAnswer, e.StudentAnswer) { // 漏选得半分
+			} else if e.StudentAnswer != "" && utils.Contains(e.RightAnswer, e.StudentAnswer) { // 漏选得半分（留空不算漏选）
 				sessionId2ScoreMap[e.ExamSessionID] += int(exam.MaqScore) * 10 / 2
 				statistics.overallCorrectScore += int(exam.MaqScore) * 10 / 2
 			}
diff --git a/server/go.mod b/server/go.mod
index 31a3d5f..51d17ee 100644
--- a/server/go.mod
+++ b/server/go.mod
@@ -6,8 +6,8 @@ require (
 	github.com/appleboy/gin-jwt/v2 v2.7.0
 	github.com/gin-contrib/cors v1.3.1
 	github.com/gin-gonic/gin v1.7.4
-	github.com/google/logger v1.1.1
 	github.com/patrickmn/go-cache v2.1.0+incompatible
+	github.com/rs/zerolog v1.27.0
 	github.com/spf13/viper v1.9.0
 	github.com/subchen/go-trylock/v2 v2.0.0
 	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519
@@ -31,7 +31,8 @@ require (
 	github.com/json-iterator/go v1.1.11 // indirect
 	github.com/leodido/go-urn v1.2.1 // indirect
 	github.com/magiconair/properties v1.8.5 // indirect
-	github.com/mattn/go-isatty v0.0.12 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/mitchellh/mapstructure v1.4.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
@@ -42,7 +43,7 @@ require (
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/subosito/gotenv v1.2.0 // indirect
 	github.com/ugorji/go/codec v1.1.7 // indirect
-	golang.org/x/sys v0.0.0-20210823070655-63515b42dcdf // indirect
+	golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6 // indirect
 	golang.org/x/text v0.3.6 // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
 	gopkg.in/ini.v1 v1.63.2 // indirect
diff --git a/server/go.sum b/server/go.sum
index 18b4fb2..423f847 100644
--- a/server/go.sum
+++ b/server/go.sum
@@ -67,6 +67,7 @@ github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnht
 github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/coreos/go-systemd/v22 v22.3.3-0.20220203105225-a9a7ef127534/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -159,8 +160,6 @@ github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
-github.com/google/logger v1.1.1 h1:+6Z2geNxc9G+4D4oDO9njjjn2d0wN5d7uOo0vOIW1NQ=
-github.com/google/logger v1.1.1/go.mod h1:BkeJZ+1FhQ+/d087r4dzojEg1u2ZX+ZqG1jTUrLM+zQ=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/martian/v3 v3.0.0/go.mod h1:y5Zk1BBys9G+gd6Jrk0W3cC1+ELVxBWuIGO+w/tUAp0=
 github.com/google/martian/v3 v3.1.0/go.mod h1:y5Zk1BBys9G+gd6Jrk0W3cC1+ELVxBWuIGO+w/tUAp0=
@@ -238,13 +237,16 @@ github.com/magiconair/properties v1.8.5/go.mod h1:y3VJvCyxH9uVvJTWEGAELF3aiYNyPK
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
 github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
 github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
+github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
 github.com/mattn/go-isatty v0.0.9/go.mod h1:YNRxwqDuOph6SZLI9vUUz6OYw3QyUt7WiY2yME+cCiQ=
 github.com/mattn/go-isatty v0.0.10/go.mod h1:qgIWMr58cqv1PHHyhnkY9lrL7etaEgOFcMEpPG5Rm84=
 github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
-github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
+github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
 github.com/miekg/dns v1.1.26/go.mod h1:bPDLeHnStXmXAq1m/Ch/hvfNHr14JKNPMBo3VZKjuso=
 github.com/mitchellh/cli v1.1.0/go.mod h1:xcISNoH86gajksDmfB23e/pu+B+GeFRMYmoHXxx3xhI=
@@ -267,6 +269,7 @@ github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTK
 github.com/pelletier/go-toml v1.9.4 h1:tjENF6MfZAg8e4ZmZTeWaWiT2vXtsoO6+iuOjFhECwM=
 github.com/pelletier/go-toml v1.9.4/go.mod h1:u1nR/EPcESfeI/szUZKdtJ0xRNbUoANCkoOuaOx1Y+c=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/sftp v1.10.1/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
@@ -275,6 +278,9 @@ github.com/posener/complete v1.2.3/go.mod h1:WZIdtGGp+qx0sLrYKtIRAruyNpv6hFCicSg
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/rs/xid v1.3.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
+github.com/rs/zerolog v1.27.0 h1:1T7qCieN22GVc8S4Q2yuexzBb1EqjbgjSH9RohbMjKs=
+github.com/rs/zerolog v1.27.0/go.mod h1:7frBqO0oezxmnO7GF86FY++uy8I0Tk/If5ni1G9Qc0U=
 github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/sagikazarmark/crypt v0.1.0/go.mod h1:B/mN0msZuINBtQ1zZLEQcegFJJf9vnYIR88KRMEuODE=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
@@ -487,7 +493,6 @@ golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210426230700-d19ff857e887/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210514084401-e8d321eab015/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210603125802-9665404d3644/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -495,8 +500,9 @@ golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210806184541-e5e7981a1069/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210823070655-63515b42dcdf h1:2ucpDCmfkl8Bd/FsLtiD653Wf96cW37s+iGx93zsu4k=
 golang.org/x/sys v0.0.0-20210823070655-63515b42dcdf/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6 h1:foEbQz/B0Oz6YIqu/69kfXPYeFQAuuMYFkjaqXzl5Wo=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/server/handlers/cache.go b/server/handlers/cache.go
index 8116c9c..409b849 100644
--- a/server/handlers/cache.go
+++ b/server/handlers/cache.go
@@ -6,8 +6,8 @@ import (
 
 	jwt "github.com/appleboy/gin-jwt/v2"
 	"github.com/gin-gonic/gin"
-	"github.com/google/logger"
 	"github.com/patrickmn/go-cache"
+	"github.com/rs/zerolog/log"
 
 	"github.com/gonearewe/EasyTesting/utils"
 )
@@ -17,7 +17,7 @@ func GetCacheHandler(c *gin.Context) {
 	if ret, found := utils.MemoryStore.Get(key); found {
 		c.String(200, ret.(string))
 	} else {
-		logger.Info("no cache found for exam_session_id: " + key)
+		log.Info().Str("exam_session_id", key).Msg("no cache found")
 	}
 }
 
diff --git a/server/handlers/exam_session_task.go b/server/handlers/exam_session_task.go
index 53db80a..3c39530 100644
--- a/server/handlers/exam_session_task.go
+++ b/server/handlers/exam_session_task.go
@@ -1,20 +1,23 @@
 package handlers
 
 import (
-	"github.com/google/logger"
-
 	"github.com/gonearewe/EasyTesting/dao"
 	"github.com/gonearewe/EasyTesting/models"
+	"github.com/rs/zerolog/log"
 )
 
 func InitTaskConsumers() {
 	const consumerNum = 8
 	for i := 0; i < consumerNum; i++ {
 		go func(id int) {
-			logger.Infof("task consumer %d started\n", id)
+			log.Info().Msgf("task consumer %d started", id)
 			defer func() {
 				if e := recover(); e != nil {
-					logger.Fatalf("task consumer %d panicked: %v", id, e)
+					if err, ok := e.(error); ok {
+						log.Fatal().Stack().Err(err).Msgf("task consumer %d panicked", id)
+					} else {
+						log.Fatal().Stack().Interface("panic value", e).Msgf("task consumer %d panicked", id)
+					}
 				}
 			}()
 
diff --git a/server/init.go b/server/init.go
index 34c1ee9..1b58fa4 100644
--- a/server/init.go
+++ b/server/init.go
@@ -1,6 +1,13 @@
 package main
 
 import (
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/gin-gonic/gin"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
 	"github.com/spf13/viper"
 )
 
@@ -15,3 +22,34 @@ func initViper() {
 
 	// Config file found and successfully parsed
 }
+
+func initLogWriter() io.Writer {
+	var file io.Writer
+	ex, err := os.Executable()
+	if err != nil {
+		panic(err)
+	}
+	exPath := filepath.Dir(ex)
+	logPath := filepath.Join(exPath, viper.GetString("log_file_name"))
+	file, err = os.Create(logPath)
+	if err != nil {
+		panic(err)
+	}
+	writer := io.MultiWriter(file, os.Stdout) // write log to both stdout and file
+	return writer
+}
+
+func initZeroLog(logWriter io.Writer) {
+	zerolog.SetGlobalLevel(zerolog.InfoLevel)
+	log.Logger = zerolog.New(logWriter).With().Timestamp().Caller().Logger()
+	log.Info().Msg("ZeroLog initialized")
+}
+
+func initGin(logWriter io.Writer) {
+	if !viper.GetBool("enable_console_color") {
+		gin.DisableConsoleColor()
+	}
+	gin.DefaultWriter = logWriter
+	gin.SetMode(gin.ReleaseMode)
+	log.Info().Msg("Gin initialized")
+}
diff --git a/server/main.go b/server/main.go
index 011a74f..cc6a16a 100644
--- a/server/main.go
+++ b/server/main.go
@@ -4,10 +4,8 @@ import (
 	"fmt"
 	"log"
 	"net/http"
-	"os"
 
 	"github.com/gin-gonic/gin"
-	"github.com/google/logger"
 	"github.com/spf13/viper"
 
 	"github.com/gonearewe/EasyTesting/dao"
@@ -17,16 +15,14 @@ import (
 
 func init() {
 	initViper()
-	logger.Init("EasyTesting", true, false, os.Stdout)
+	writer := initLogWriter()
+	initZeroLog(writer)
 	handlers.InitTaskConsumers()
-	dao.InitDb()
+	dao.InitDb(writer)
+	initGin(writer)
 }
 
 func main() {
-	if viper.GetBool("disable_console_color") {
-		gin.DisableConsoleColor()
-	}
-	gin.SetMode(gin.ReleaseMode)
 	r := gin.New()
 	teacherAuthRouter, adminAuthRouter, studentAuthRouter := middlewares.SetupMiddleWares(r)
 	SetupRoute(r, teacherAuthRouter, adminAuthRouter, studentAuthRouter)
diff --git a/server/middlewares/recovery.go b/server/middlewares/recovery.go
index 993d756..3c59538 100644
--- a/server/middlewares/recovery.go
+++ b/server/middlewares/recovery.go
@@ -1,21 +1,18 @@
 package middlewares
 
 import (
-	"runtime"
-
 	"github.com/gin-gonic/gin"
-	"github.com/google/logger"
+	"github.com/rs/zerolog/log"
 )
 
 func recovery(c *gin.Context) {
 	defer func() {
-		if err := recover(); err != nil {
-			trace := make([]byte, 1<<16)
-			// get error stack info
-			n := runtime.Stack(trace, false)
-			logger.Errorf("%v\n%s", err, string(trace[:n]))
-			// logger.Error(err)
-			c.AbortWithStatus(400)
+		if e := recover(); e != nil {
+			if err, ok := e.(error); ok {
+				log.Error().Stack().Err(err).Msg("Gin recover")
+			} else {
+				log.Error().Stack().Interface("panic value", e).Msg("Gin recover")
+			}
 		}
 	}()
 	c.Next()
diff --git a/server/server-config.yaml b/server/server-config.yaml
index f56a548..aa43175 100644
--- a/server/server-config.yaml
+++ b/server/server-config.yaml
@@ -1,5 +1,6 @@
 # 服务端软件的配置文件，应当与程序放在同一级目录下，不支持热重载，修改后需要重启程序才能生效
-disable_console_color: true # console 输出是否禁用颜色，如果日志输出到文件，控制颜色的字符会变成乱码
+enable_console_color: false # console 输出是否使用颜色，如果日志输出到文件，控制颜色的字符会变成乱码
 dsn: "root:12345@tcp(127.0.0.1:3306)/easy_testing?charset=utf8mb4&parseTime=True&loc=Local" # 数据库 DSN
 port: 9345 # 服务器监听的端口
-jwt_secret_key: "4xg8jlAh8s00KR1Fdc6mY" # JWT 使用的密钥，建议正式部署时修改它
\ No newline at end of file
+jwt_secret_key: "4xg8jlAh8s00KR1Fdc6mY" # JWT 使用的密钥，建议正式部署时修改它
+log_file_name: "debug.log" # 日志文件的名字，文件将位于执行程序目录（或其快捷方式目录）下；日志会在 stdout 和文件中同步出现
\ No newline at end of file
diff --git a/test/student.py b/test/student.py
index e57c5f0..b4f2ca2 100644
--- a/test/student.py
+++ b/test/student.py
@@ -1,4 +1,4 @@
-# Run this with `pipenv run locust -f .\student.py -H http://localhost:9000`,
+# Run this with `pipenv run locust -f .\student.py -H http://localhost:9345`,
 # and use Web UI at `http://localhost:8089/`
 import random