diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Add.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Add.java
index 2633a23388eb94..2be8a3c2c0cb42 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Add.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Add.java
@@ -49,7 +49,9 @@ public Expression withChildren(List<Expression> children) {
 
     @Override
     public DecimalV3Type getDataTypeForDecimalV3(DecimalV3Type t1, DecimalV3Type t2) {
-        return (DecimalV3Type) DecimalV3Type.widerDecimalV3Type(t1, t2, false);
+        DecimalV3Type decimalV3Type = (DecimalV3Type) DecimalV3Type.widerDecimalV3Type(t1, t2, false);
+        return (DecimalV3Type) DecimalV3Type.createDecimalV3Type(decimalV3Type.getPrecision() + 1,
+                decimalV3Type.getScale());
     }
 
     @Override
diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Subtract.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Subtract.java
index a7367142ec4e5d..1536d88d0284d9 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Subtract.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/Subtract.java
@@ -49,7 +49,9 @@ public Expression withChildren(List<Expression> children) {
 
     @Override
     public DecimalV3Type getDataTypeForDecimalV3(DecimalV3Type t1, DecimalV3Type t2) {
-        return (DecimalV3Type) DecimalV3Type.widerDecimalV3Type(t1, t2, false);
+        DecimalV3Type decimalV3Type = (DecimalV3Type) DecimalV3Type.widerDecimalV3Type(t1, t2, false);
+        return (DecimalV3Type) DecimalV3Type.createDecimalV3Type(decimalV3Type.getPrecision() + 1,
+                decimalV3Type.getScale());
     }
 
     @Override
diff --git a/fe/fe-core/src/test/java/org/apache/doris/nereids/util/TypeCoercionUtilsTest.java b/fe/fe-core/src/test/java/org/apache/doris/nereids/util/TypeCoercionUtilsTest.java
index 0740403373503b..a30d67d4d314e4 100644
--- a/fe/fe-core/src/test/java/org/apache/doris/nereids/util/TypeCoercionUtilsTest.java
+++ b/fe/fe-core/src/test/java/org/apache/doris/nereids/util/TypeCoercionUtilsTest.java
@@ -727,12 +727,12 @@ public void testDecimalArithmetic() {
                 new DecimalV3Literal(new BigDecimal("123.45")));
         expression = TypeCoercionUtils.processBinaryArithmetic(add);
         Assertions.assertEquals(expression.child(0),
-                new Cast(multiply.child(0), DecimalV3Type.createDecimalV3Type(9, 3)));
+                new Cast(multiply.child(0), DecimalV3Type.createDecimalV3Type(10, 3)));
 
         Subtract sub = new Subtract(new DecimalLiteral(new BigDecimal("987654.321")),
                 new DecimalV3Literal(new BigDecimal("123.45")));
         expression = TypeCoercionUtils.processBinaryArithmetic(sub);
         Assertions.assertEquals(expression.child(0),
-                new Cast(multiply.child(0), DecimalV3Type.createDecimalV3Type(9, 3)));
+                new Cast(multiply.child(0), DecimalV3Type.createDecimalV3Type(10, 3)));
     }
 }