diff --git a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
index 046dc28c4a4dee..6dee4c9c711891 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/qe/SessionVariable.java
@@ -799,7 +799,7 @@ public class SessionVariable implements Serializable, Writable {
     public String timeZone = TimeUtils.getSystemTimeZone().getID();
 
     @VariableMgr.VarAttr(name = PARALLEL_EXCHANGE_INSTANCE_NUM)
-    public int exchangeInstanceParallel = -1;
+    public int exchangeInstanceParallel = 100;
 
     @VariableMgr.VarAttr(name = SQL_SAFE_UPDATES)
     public int sqlSafeUpdates = 0;