diff --git a/executor/analyze_test.go b/executor/analyze_test.go
index ce5e9b4a9130a..48e725ec912b0 100644
--- a/executor/analyze_test.go
+++ b/executor/analyze_test.go
@@ -369,8 +369,8 @@ func TestAnalyzePartitionTableByConcurrencyInDynamic(t *testing.T) {
 	for _, tc := range testcases {
 		concurrency := tc.concurrency
 		fmt.Println("testcase ", concurrency)
-		tk.MustExec(fmt.Sprintf("set @@tidb_merge_partition_stats_concurrency=%v", concurrency))
-		tk.MustQuery("select @@tidb_merge_partition_stats_concurrency").Check(testkit.Rows(concurrency))
+		tk.MustExec(fmt.Sprintf("set @@global.tidb_merge_partition_stats_concurrency=%v", concurrency))
+		tk.MustQuery("select @@global.tidb_merge_partition_stats_concurrency").Check(testkit.Rows(concurrency))
 		tk.MustExec(fmt.Sprintf("set @@tidb_analyze_partition_concurrency=%v", concurrency))
 		tk.MustQuery("select @@tidb_analyze_partition_concurrency").Check(testkit.Rows(concurrency))
 
diff --git a/statistics/handle/handle.go b/statistics/handle/handle.go
index 1a934e068a22a..b9bb52d4a3ac6 100644
--- a/statistics/handle/handle.go
+++ b/statistics/handle/handle.go
@@ -636,6 +636,15 @@ func (h *Handle) UpdateSessionVar() error {
 		return err
 	}
 	h.mu.ctx.GetSessionVars().AnalyzeVersion = int(ver)
+	verInString, err = h.mu.ctx.GetSessionVars().GlobalVarsAccessor.GetGlobalSysVar(variable.TiDBMergePartitionStatsConcurrency)
+	if err != nil {
+		return err
+	}
+	ver2, err := strconv.ParseInt(verInString, 10, 64)
+	if err != nil {
+		return err
+	}
+	h.mu.ctx.GetSessionVars().AnalyzePartitionMergeConcurrency = int(ver2)
 	return err
 }