diff --git a/build.sh b/build.sh
index d430cdbb198643..56a9571e2deca2 100755
--- a/build.sh
+++ b/build.sh
@@ -48,8 +48,6 @@ if [[ ! -f ${DORIS_THIRDPARTY}/installed/lib/libs2.a ]]; then
     ${DORIS_THIRDPARTY}/build-thirdparty.sh
 fi
 
-PARALLEL=$[$(nproc)/4+1]
-
 # Check args
 usage() {
   echo "
@@ -92,7 +90,7 @@ fi
 
 eval set -- "$OPTS"
 
-PARALLEL=$[$(nproc)+1]
+PARALLEL=$[$(nproc)/4+1]
 BUILD_BE=
 BUILD_FE=
 BUILD_UI=
diff --git a/run-be-ut.sh b/run-be-ut.sh
index 590b4c4cfea369..4ca5c274e1a600 100755
--- a/run-be-ut.sh
+++ b/run-be-ut.sh
@@ -73,7 +73,7 @@ fi
 
 eval set -- "$OPTS"
 
-PARALLEL=$[$(nproc)/2+1]
+PARALLEL=$[$(nproc)/4+1]
 CLEAN=
 RUN=
 if [ $# == 1 ] ; then