diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SimplifyComparisonPredicate.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SimplifyComparisonPredicate.java
index cdc4d80a8a..c66e27e8b2 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SimplifyComparisonPredicate.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/SimplifyComparisonPredicate.java
@@ -203,7 +203,8 @@ public class SimplifyComparisonPredicate extends AbstractExpressionRewriteRule {
             right = temp;
         }
 
-        if (left instanceof Cast && right instanceof DecimalV3Literal) {
+        if (left instanceof Cast && left.child(0).getDataType().isDecimalV3Type()
+                && right instanceof DecimalV3Literal) {
             Cast cast = (Cast) left;
             left = cast.child();
             DecimalV3Literal literal = (DecimalV3Literal) right;
diff --git a/regression-test/suites/nereids_syntax_p0/test_simplify_comparison.groovy b/regression-test/suites/nereids_syntax_p0/test_simplify_comparison.groovy
index c252e8b86c..53c0ff9a12 100644
--- a/regression-test/suites/nereids_syntax_p0/test_simplify_comparison.groovy
+++ b/regression-test/suites/nereids_syntax_p0/test_simplify_comparison.groovy
@@ -70,4 +70,6 @@ suite("test_simplify_comparison") {
         contains ">= 111.12"
         contains ">= '2023-06-16 00:00:00'"
     }
+
+    sql "select cast('1234' as decimalv3(18,4)) > 2000;"
 }
\ No newline at end of file