diff --git a/src/main/java/haidnor/jvm/instruction/InstructionFactory.java b/src/main/java/haidnor/jvm/instruction/InstructionFactory.java
index 7e2958a..27f87b8 100644
--- a/src/main/java/haidnor/jvm/instruction/InstructionFactory.java
+++ b/src/main/java/haidnor/jvm/instruction/InstructionFactory.java
@@ -301,10 +301,10 @@ public abstract class InstructionFactory {
                 return new DUP2(codeStream);
             }
             case Const.DUP2_X1 -> {
-                throw new Error("Not support JavaVM opcode DUP2_X1");
+                return new DUP2_X1(codeStream);
             }
             case Const.DUP2_X2 -> {
-                throw new Error("Not support JavaVM opcode DUP2_X2");
+                return new DUP2_X2(codeStream);
             }
             case Const.SWAP -> {
                 return new SWAP(codeStream);
diff --git a/src/main/java/haidnor/jvm/instruction/stack/DUP2_X1.java b/src/main/java/haidnor/jvm/instruction/stack/DUP2_X1.java
new file mode 100644
index 0000000..eb94553
--- /dev/null
+++ b/src/main/java/haidnor/jvm/instruction/stack/DUP2_X1.java
@@ -0,0 +1,36 @@
+package haidnor.jvm.instruction.stack;
+
+import haidnor.jvm.instruction.Instruction;
+import haidnor.jvm.runtime.Frame;
+import haidnor.jvm.runtime.StackValue;
+import haidnor.jvm.util.CodeStream;
+import lombok.SneakyThrows;
+import org.apache.bcel.Const;
+
+public class DUP2_X1 extends Instruction {
+
+    public DUP2_X1(CodeStream codeStream) {
+        super(codeStream);
+    }
+
+    @Override
+    @SneakyThrows
+    public void execute(Frame frame) {
+        StackValue stackValue1 = frame.pop();
+        StackValue stackValue2 = frame.pop();
+
+        if (stackValue1.getType() == Const.T_DOUBLE || stackValue1.getType() == Const.T_LONG) {
+            frame.push(stackValue1);
+            frame.push(stackValue2);
+            frame.push(stackValue1);
+        } else {
+            StackValue stackValue3 = frame.pop();
+            frame.push(stackValue1);
+            frame.push(stackValue2);
+            frame.push(stackValue3);
+            frame.push(stackValue1);
+            frame.push(stackValue2);
+        }
+    }
+
+}
diff --git a/src/main/java/haidnor/jvm/instruction/stack/DUP2_X2.java b/src/main/java/haidnor/jvm/instruction/stack/DUP2_X2.java
new file mode 100644
index 0000000..68b8b36
--- /dev/null
+++ b/src/main/java/haidnor/jvm/instruction/stack/DUP2_X2.java
@@ -0,0 +1,70 @@
+package haidnor.jvm.instruction.stack;
+
+import haidnor.jvm.instruction.Instruction;
+import haidnor.jvm.runtime.Frame;
+import haidnor.jvm.runtime.StackValue;
+import haidnor.jvm.util.CodeStream;
+import lombok.SneakyThrows;
+import org.apache.bcel.Const;
+
+/**
+ * @author wang xiang
+ */
+public class DUP2_X2 extends Instruction {
+
+    public DUP2_X2(CodeStream codeStream) {
+        super(codeStream);
+    }
+
+    @Override
+    @SneakyThrows
+    public void execute(Frame frame) {
+        StackValue stackValue1 = frame.pop();
+        // v1(64)
+        if (stackValue1.getType() == Const.T_DOUBLE || stackValue1.getType() == Const.T_LONG) {
+            StackValue stackValue2 = frame.pop();
+
+            // v1(64) v2(64)
+            if (stackValue2.getType() == Const.T_DOUBLE || stackValue2.getType() == Const.T_LONG) {
+                frame.push(stackValue1);
+                frame.push(stackValue2);
+                frame.push(stackValue1);
+            }
+            // v1(64) v2(32)
+            else {
+                StackValue stackValue3 = frame.pop();
+
+                frame.push(stackValue1);
+                frame.push(stackValue2);
+                frame.push(stackValue3);
+                frame.push(stackValue1);
+            }
+        }
+        // v1(32)
+        else {
+            StackValue stackValue2 = frame.pop();
+            StackValue stackValue3 = frame.pop();
+
+            // v1(32) v2(32) v3(64)
+            if (stackValue3.getType() == Const.T_DOUBLE || stackValue3.getType() == Const.T_LONG) {
+                frame.push(stackValue1);
+                frame.push(stackValue2);
+                frame.push(stackValue3);
+                frame.push(stackValue1);
+                frame.push(stackValue2);
+            }
+            // v1(32) v2(32) v3(32) v4(32)
+            else {
+                StackValue stackValue4 = frame.pop();
+
+                frame.push(stackValue1);
+                frame.push(stackValue2);
+                frame.push(stackValue3);
+                frame.push(stackValue4);
+                frame.push(stackValue1);
+                frame.push(stackValue2);
+            }
+        }
+    }
+
+}