diff --git a/gluten-ut/spark33/src/test/scala/org/apache/spark/sql/execution/adaptive/GlutenAdaptiveQueryExecSuite.scala b/gluten-ut/spark33/src/test/scala/org/apache/spark/sql/execution/adaptive/GlutenAdaptiveQueryExecSuite.scala
index 9a9dd77e4364e..a2d9a5ab77105 100644
--- a/gluten-ut/spark33/src/test/scala/org/apache/spark/sql/execution/adaptive/GlutenAdaptiveQueryExecSuite.scala
+++ b/gluten-ut/spark33/src/test/scala/org/apache/spark/sql/execution/adaptive/GlutenAdaptiveQueryExecSuite.scala
@@ -438,7 +438,8 @@ class GlutenAdaptiveQueryExecSuite extends AdaptiveQueryExecSuite with GlutenSQL
   test("gluten Exchange reuse") {
     withSQLConf(
       SQLConf.ADAPTIVE_EXECUTION_ENABLED.key -> "true",
-      SQLConf.AUTO_BROADCASTJOIN_THRESHOLD.key -> "100",
+      // magic threshold, ch backend has two bhj when threshold is 100
+      SQLConf.AUTO_BROADCASTJOIN_THRESHOLD.key -> "90",
       SQLConf.SHUFFLE_PARTITIONS.key -> "5") {
       val (plan, adaptivePlan) = runAdaptiveAndVerifyResult(
         "SELECT value FROM testData join testData2 ON key = a " +