diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rewrite/rules/SimplifyCastRule.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rewrite/rules/SimplifyCastRule.java
index 5e9fd3465a..24cebf3bc8 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rewrite/rules/SimplifyCastRule.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rewrite/rules/SimplifyCastRule.java
@@ -21,14 +21,22 @@ import org.apache.doris.nereids.rules.expression.rewrite.AbstractExpressionRewri
 import org.apache.doris.nereids.rules.expression.rewrite.ExpressionRewriteContext;
 import org.apache.doris.nereids.trees.expressions.Cast;
 import org.apache.doris.nereids.trees.expressions.Expression;
+import org.apache.doris.nereids.trees.expressions.literal.BigIntLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.CharLiteral;
+import org.apache.doris.nereids.trees.expressions.literal.DecimalLiteral;
+import org.apache.doris.nereids.trees.expressions.literal.IntegerLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.Literal;
+import org.apache.doris.nereids.trees.expressions.literal.SmallIntLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.StringLiteral;
+import org.apache.doris.nereids.trees.expressions.literal.TinyIntLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.VarcharLiteral;
 import org.apache.doris.nereids.types.DataType;
+import org.apache.doris.nereids.types.DecimalType;
 import org.apache.doris.nereids.types.StringType;
 import org.apache.doris.nereids.types.VarcharType;
 
+import java.math.BigDecimal;
+
 /**
  * Rewrite rule of simplify CAST expression.
  * Remove redundant cast like
@@ -55,7 +63,7 @@ public class SimplifyCastRule extends AbstractExpressionRewriteRule {
         }
 
         if (child instanceof Literal) {
-            // TODO: just trick here, process other type
+            // TODO: process other type
             DataType castType = cast.getDataType();
             if (castType instanceof StringType) {
                 if (child instanceof VarcharLiteral) {
@@ -69,6 +77,16 @@ public class SimplifyCastRule extends AbstractExpressionRewriteRule {
                 } else if (child instanceof CharLiteral) {
                     return new VarcharLiteral(((CharLiteral) child).getValue(), ((VarcharType) castType).getLen());
                 }
+            } else if (castType instanceof DecimalType) {
+                if (child instanceof TinyIntLiteral) {
+                    return new DecimalLiteral(new BigDecimal(((TinyIntLiteral) child).getValue()));
+                } else if (child instanceof SmallIntLiteral) {
+                    return new DecimalLiteral(new BigDecimal(((SmallIntLiteral) child).getValue()));
+                } else if (child instanceof IntegerLiteral) {
+                    return new DecimalLiteral(new BigDecimal(((IntegerLiteral) child).getValue()));
+                } else if (child instanceof BigIntLiteral) {
+                    return new DecimalLiteral(new BigDecimal(((BigIntLiteral) child).getValue()));
+                }
             }
         }
 
diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/literal/Literal.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/literal/Literal.java
index 561c2c8180..6c8dc2677e 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/literal/Literal.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/literal/Literal.java
@@ -48,7 +48,7 @@ public abstract class Literal extends Expression implements LeafExpression {
      * @param dataType logical data type in Nereids
      */
     public Literal(DataType dataType) {
-        this.dataType = dataType;
+        this.dataType = Objects.requireNonNull(dataType);
     }
 
     /**
diff --git a/fe/fe-core/src/test/java/org/apache/doris/nereids/rules/expression/rewrite/ExpressionRewriteTest.java b/fe/fe-core/src/test/java/org/apache/doris/nereids/rules/expression/rewrite/ExpressionRewriteTest.java
index ab7ca66768..ef5f78f28e 100644
--- a/fe/fe-core/src/test/java/org/apache/doris/nereids/rules/expression/rewrite/ExpressionRewriteTest.java
+++ b/fe/fe-core/src/test/java/org/apache/doris/nereids/rules/expression/rewrite/ExpressionRewriteTest.java
@@ -25,15 +25,23 @@ import org.apache.doris.nereids.rules.expression.rewrite.rules.NormalizeBinaryPr
 import org.apache.doris.nereids.rules.expression.rewrite.rules.SimplifyCastRule;
 import org.apache.doris.nereids.rules.expression.rewrite.rules.SimplifyNotExprRule;
 import org.apache.doris.nereids.trees.expressions.Cast;
+import org.apache.doris.nereids.trees.expressions.literal.BigIntLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.CharLiteral;
+import org.apache.doris.nereids.trees.expressions.literal.DecimalLiteral;
+import org.apache.doris.nereids.trees.expressions.literal.IntegerLiteral;
+import org.apache.doris.nereids.trees.expressions.literal.SmallIntLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.StringLiteral;
+import org.apache.doris.nereids.trees.expressions.literal.TinyIntLiteral;
 import org.apache.doris.nereids.trees.expressions.literal.VarcharLiteral;
+import org.apache.doris.nereids.types.DecimalType;
 import org.apache.doris.nereids.types.StringType;
 import org.apache.doris.nereids.types.VarcharType;
 
 import com.google.common.collect.ImmutableList;
 import org.junit.jupiter.api.Test;
 
+import java.math.BigDecimal;
+
 /**
  * all expr rewrite rule test case.
  */
@@ -193,5 +201,15 @@ public class ExpressionRewriteTest extends ExpressionRewriteTestHelper {
                 new VarcharLiteral("123", 10));
         assertRewrite(new Cast(new CharLiteral("123", 3), StringType.INSTANCE), new StringLiteral("123"));
         assertRewrite(new Cast(new VarcharLiteral("123", 3), StringType.INSTANCE), new StringLiteral("123"));
+
+        // decimal literal
+        assertRewrite(new Cast(new TinyIntLiteral((byte) 1), DecimalType.createDecimalType(15, 9)),
+                new DecimalLiteral(new BigDecimal(1)));
+        assertRewrite(new Cast(new SmallIntLiteral((short) 1), DecimalType.createDecimalType(15, 9)),
+                new DecimalLiteral(new BigDecimal(1)));
+        assertRewrite(new Cast(new IntegerLiteral(1), DecimalType.createDecimalType(15, 9)),
+                new DecimalLiteral(new BigDecimal(1)));
+        assertRewrite(new Cast(new BigIntLiteral(1L), DecimalType.createDecimalType(15, 9)),
+                new DecimalLiteral(new BigDecimal(1)));
     }
 }