diff --git a/ets2panda/checker/ETSAnalyzer.cpp b/ets2panda/checker/ETSAnalyzer.cpp
index aa6eb3ff15eeeb4e0fd60cd6b0bac4846ce45784..10d0b983d65b1d7eafe89135f9821d49b47436ff 100644
--- a/ets2panda/checker/ETSAnalyzer.cpp
+++ b/ets2panda/checker/ETSAnalyzer.cpp
@@ -1073,6 +1073,33 @@ checker::Type *ETSAnalyzer::GetSmartType(ir::AssignmentExpression *expr, checker
     return smartType;
 }
 
+static bool IsMethodDefinition(const ir::Expression *const expression)
+{
+    return expression->IsMemberExpression() && expression->AsMemberExpression()->Property() != nullptr &&
+           expression->AsMemberExpression()->Property()->Variable() != nullptr &&
+           expression->AsMemberExpression()->Property()->Variable()->Declaration() != nullptr &&
+           expression->AsMemberExpression()->Property()->Variable()->Declaration()->Node()->IsMethodDefinition();
+}
+
+static bool IsInvalidMethodAssignment(const ir::AssignmentExpression *const expr, ETSChecker *checker)
+{
+    auto left = expr->Left();
+    if (IsMethodDefinition(left)) {
+        {
+            auto methodDefinition =
+                left->AsMemberExpression()->Property()->Variable()->Declaration()->Node()->AsMethodDefinition();
+            if (!methodDefinition->IsSetter() &&
+                std::none_of(methodDefinition->Overloads().cbegin(), methodDefinition->Overloads().cend(),
+                             [](const auto *overload) { return overload->IsSetter(); })) {
+                checker->LogError(diagnostic::METHOD_ASSIGNMENT, expr->Left()->Start());
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
 checker::Type *ETSAnalyzer::Check(ir::AssignmentExpression *const expr) const
 {
     if (expr->TsType() != nullptr) {
@@ -1087,7 +1114,7 @@ checker::Type *ETSAnalyzer::Check(ir::AssignmentExpression *const expr) const
 
     const auto leftType = expr->Left()->Check(checker);
 
-    if (IsInvalidArrayMemberAssignment(expr, checker)) {
+    if (IsInvalidArrayMemberAssignment(expr, checker) || IsInvalidMethodAssignment(expr, checker)) {
         expr->SetTsType(checker->GlobalTypeError());
         return expr->TsType();
     }
diff --git a/ets2panda/test/ast/compiler/ets/identifierReference9.ets b/ets2panda/test/ast/compiler/ets/identifierReference9.ets
index 006fc0197dbf87ac079541132e0dd7e22a2993ed..3021ebf7a1953f57ccd1e53d8ba2ba11c4805025 100644
--- a/ets2panda/test/ast/compiler/ets/identifierReference9.ets
+++ b/ets2panda/test/ast/compiler/ets/identifierReference9.ets
@@ -25,4 +25,4 @@ class A {
   }
 }
 
-/* @@? 24:16 Error TypeError: Type 'Int' cannot be assigned to type '() => void'  */
+/* @@? 24:5 Error TypeError: Class methods cannot be overwritten.  */
diff --git a/ets2panda/test/ast/compiler/ets/method-assignment.ets b/ets2panda/test/ast/compiler/ets/method-assignment.ets
new file mode 100644
index 0000000000000000000000000000000000000000..8bf46b3b8dda5d946381769cc48228a96d5c63f8
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/method-assignment.ets
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+class Base {
+    baseFoo() {}
+    static staticBaseFoo() {}
+}
+
+interface I {
+    interfaceFoo() {}
+}
+
+class C extends Base implements I {
+    foo1() {}
+    static foo2() {}
+
+    constructor()
+    {
+        this.interfaceFoo = bar;
+    }
+
+    constructor(arg: () => void)
+    {
+        this.foo1 = arg;
+    }
+}
+
+function bar() {}
+
+let c = new C();
+c = new C(bar);
+c.baseFoo = bar;
+C.staticBaseFoo = bar;
+c.foo1 = bar;
+C.foo2 = bar;
+c.interfaceFoo = bar;
+
+/* @@? 31:9 Error TypeError: Class methods cannot be overwritten. */
+/* @@? 36:9 Error TypeError: Class methods cannot be overwritten. */
+/* @@? 44:1 Error TypeError: Class methods cannot be overwritten. */
+/* @@? 45:1 Error TypeError: Class methods cannot be overwritten. */
+/* @@? 46:1 Error TypeError: Class methods cannot be overwritten. */
+/* @@? 47:1 Error TypeError: Class methods cannot be overwritten. */
+/* @@? 48:1 Error TypeError: Class methods cannot be overwritten. */
diff --git a/ets2panda/util/diagnostic/semantic.yaml b/ets2panda/util/diagnostic/semantic.yaml
index 4c4ae2e28ecd4f21ea96d41b0697c01a66857615..98f294186329dc3ac0f3d53b6401673de29d1f10 100644
--- a/ets2panda/util/diagnostic/semantic.yaml
+++ b/ets2panda/util/diagnostic/semantic.yaml
@@ -1514,3 +1514,7 @@ semantic:
 - name: DYMANIC_INIT_WITH_OBJEXPR
   id: 382
   message: "Dymanic Type {} cannot be initialize with an object expression"
+
+- name: METHOD_ASSIGNMENT
+  id: 383
+  message: "Class methods cannot be overwritten."
\ No newline at end of file