diff --git a/executor/tiflashtest/BUILD.bazel b/executor/tiflashtest/BUILD.bazel
index 00c3364890678..0af1c5394cfa7 100644
--- a/executor/tiflashtest/BUILD.bazel
+++ b/executor/tiflashtest/BUILD.bazel
@@ -9,7 +9,7 @@ go_test(
     ],
     flaky = True,
     race = "on",
-    shard_count = 38,
+    shard_count = 39,
     deps = [
         "//config",
         "//domain",
diff --git a/executor/tiflashtest/tiflash_test.go b/executor/tiflashtest/tiflash_test.go
index 7a99bab37c86d..9c6b9084223a3 100644
--- a/executor/tiflashtest/tiflash_test.go
+++ b/executor/tiflashtest/tiflash_test.go
@@ -1738,3 +1738,35 @@ func TestMppStoreCntWithErrors(t *testing.T) {
 	require.Nil(t, failpoint.Disable(mppStoreCountSetLastUpdateTimeP2))
 	require.Nil(t, failpoint.Disable(mppStoreCountPDError))
 }
+
+func TestIndexMergeCarePreferTiflash(t *testing.T) {
+	store := testkit.CreateMockStore(t, withMockTiFlash(1))
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("CREATE TABLE `t` (" +
+		"`i` bigint(20) NOT NULL, " +
+		"`w` varchar(32) NOT NULL," +
+		"`l` varchar(32) NOT NULL," +
+		"`a` tinyint(4) NOT NULL DEFAULT '0'," +
+		"`m` int(11) NOT NULL DEFAULT '0'," +
+		"`s` int(11) NOT NULL DEFAULT '0'," +
+		"PRIMARY KEY (`i`) /*T![clustered_index] NONCLUSTERED */," +
+		"KEY `idx_win_user_site_code` (`w`,`m`)," +
+		"KEY `idx_lose_user_site_code` (`l`,`m`)," +
+		"KEY `idx_win_site_code_status` (`w`,`a`)," +
+		"KEY `idx_lose_site_code_status` (`l`,`a`)" +
+		")")
+	tk.MustExec("alter table t set tiflash replica 1")
+	tb := external.GetTableByName(t, tk, "test", "t")
+	err := domain.GetDomain(tk.Session()).DDL().UpdateTableReplicaInfo(tk.Session(), tb.Meta().ID, true)
+	require.NoError(t, err)
+	tk.MustQuery("explain format=\"brief\" SELECT" +
+		"      /*+ read_from_storage(tiflash[a]) */ a.i FROM t a WHERE a.s = 0 AND a.a NOT IN (-1, 0) AND m >= 1726910326 AND m <= 1726910391 AND ( a.w IN ('1123') OR a.l IN ('1123'))").Check(
+		testkit.Rows("TableReader 0.00 root  MppVersion: 1, data:ExchangeSender",
+			"└─ExchangeSender 0.00 mpp[tiflash]  ExchangeType: PassThrough",
+			"  └─Projection 0.00 mpp[tiflash]  test.t.i",
+			"    └─Selection 0.00 mpp[tiflash]  ge(test.t.m, 1726910326), le(test.t.m, 1726910391), not(in(test.t.a, -1, 0)), or(eq(test.t.w, \"1123\"), eq(test.t.l, \"1123\"))",
+			"      └─TableFullScan 10.00 mpp[tiflash] table:a pushed down filter:eq(test.t.s, 0), keep order:false, stats:pseudo"))
+}
diff --git a/planner/core/casetest/testdata/plan_suite_out.json b/planner/core/casetest/testdata/plan_suite_out.json
index 214a24a6fb1c0..16e2507456f5b 100644
--- a/planner/core/casetest/testdata/plan_suite_out.json
+++ b/planner/core/casetest/testdata/plan_suite_out.json
@@ -406,11 +406,11 @@
           "└─ExchangeSender 4439.11 mpp[tiflash]  ExchangeType: PassThrough",
           "  └─Projection 4439.11 mpp[tiflash]  test.t.a, Column#5",
           "    └─Projection 4439.11 mpp[tiflash]  Column#5, test.t.a",
-          "      └─HashAgg 4439.11 mpp[tiflash]  group by:test.t.a, test.t.c, funcs:sum(Column#16)->Column#5, funcs:firstrow(test.t.a)->test.t.a",
+          "      └─HashAgg 4439.11 mpp[tiflash]  group by:test.t.a, test.t.c, funcs:sum(Column#10)->Column#5, funcs:firstrow(test.t.a)->test.t.a",
           "        └─ExchangeReceiver 4439.11 mpp[tiflash]  ",
           "          └─ExchangeSender 4439.11 mpp[tiflash]  ExchangeType: HashPartition, Compression: FAST, Hash Cols: [name: test.t.a, collate: binary], [name: test.t.c, collate: binary]",
-          "            └─HashAgg 4439.11 mpp[tiflash]  group by:Column#19, Column#20, funcs:sum(Column#18)->Column#16",
-          "              └─Projection 5548.89 mpp[tiflash]  cast(test.t.b, decimal(10,0) BINARY)->Column#18, test.t.a, test.t.c",
+          "            └─HashAgg 4439.11 mpp[tiflash]  group by:Column#13, Column#14, funcs:sum(Column#12)->Column#10",
+          "              └─Projection 5548.89 mpp[tiflash]  cast(test.t.b, decimal(10,0) BINARY)->Column#12, test.t.a, test.t.c",
           "                └─Selection 5548.89 mpp[tiflash]  or(lt(test.t.b, 2), gt(test.t.a, 2))",
           "                  └─TableFullScan 10000.00 mpp[tiflash] table:t pushed down filter:empty, keep order:false, stats:pseudo"
         ],
diff --git a/planner/core/find_best_task.go b/planner/core/find_best_task.go
index 673d1463e5374..7430318b6e772 100644
--- a/planner/core/find_best_task.go
+++ b/planner/core/find_best_task.go
@@ -963,6 +963,10 @@ func (ds *DataSource) findBestTask(prop *property.PhysicalProperty, planCounter
 	for _, candidate := range candidates {
 		path := candidate.path
 		if path.PartialIndexPaths != nil {
+			// prefer tiflash, while current table path is tikv, skip it.
+			if ds.preferStoreType&preferTiFlash != 0 && path.StoreType == kv.TiKV {
+				continue
+			}
 			idxMergeTask, err := ds.convertToIndexMergeScan(prop, candidate, opt)
 			if err != nil {
 				return nil, 0, err