diff --git a/es2panda/lexer/token/token.cpp b/es2panda/lexer/token/token.cpp
index 12521b9dada193b33275e445a53d6700fe3a9e84..ba04e5d974b6ad3ba5311ee9f045d729d15fb55f 100644
--- a/es2panda/lexer/token/token.cpp
+++ b/es2panda/lexer/token/token.cpp
@@ -92,6 +92,27 @@ bool Token::IsReservedTypeName() const
     }
 }
 
+bool Token::IsJsStrictReservedWord() const
+{
+    switch (keywordType_)
+    {
+        case TokenType::KEYW_ARGUMENTS:
+        case TokenType::KEYW_EVAL:
+        case TokenType::KEYW_STATIC:
+        case TokenType::KEYW_PRIVATE:
+        case TokenType::KEYW_PROTECTED:
+        case TokenType::KEYW_PUBLIC:
+        case TokenType::KEYW_IMPLEMENTS:
+        case TokenType::KEYW_INTERFACE:
+        case TokenType::KEYW_PACKAGE:
+        case TokenType::KEYW_LET:
+        case TokenType::KEYW_YIELD:
+            return true;
+        default:
+            return false;
+    }
+}
+
 bool Token::IsBinaryToken(TokenType type)
 {
     return (type >= TokenType::PUNCTUATOR_NULLISH_COALESCING && type <= TokenType::PUNCTUATOR_EXPONENTIATION);
diff --git a/es2panda/lexer/token/token.h b/es2panda/lexer/token/token.h
index 46a87d432cc1ff7cf96671e75e9391c196b298ae..26edb60d38c145034069ad58cb977c668d3cdd0b 100644
--- a/es2panda/lexer/token/token.h
+++ b/es2panda/lexer/token/token.h
@@ -116,6 +116,7 @@ public:
     bool IsPropNameLiteral() const;
     bool IsKeyword() const;
     bool IsReservedTypeName() const;
+    bool IsJsStrictReservedWord() const;
 
     static bool IsBinaryToken(TokenType type);
     static bool IsBinaryLvalueToken(TokenType type);
diff --git a/es2panda/parser/expressionParser.cpp b/es2panda/parser/expressionParser.cpp
index e66239d1893d2a2d1d6f74b61677e1ce24c94336..7828ec29fb3878786e8c9c0b821701017e350270 100644
--- a/es2panda/parser/expressionParser.cpp
+++ b/es2panda/parser/expressionParser.cpp
@@ -2339,8 +2339,14 @@ ir::FunctionExpression *ParserImpl::ParseFunctionExpression(ParserStatus newStat
                 ThrowSyntaxError("Expected an identifier.");
             }
 
-            if (lexer_->GetToken().KeywordType() >= lexer::TokenType::KEYW_ARGUMENTS) {
-                ThrowSyntaxError("Unexpected reserved word in strict mode.");
+            if (Extension() == ScriptExtension::JS) {
+                if (lexer_->GetToken().IsJsStrictReservedWord()) {
+                    ThrowSyntaxError("Unexpected reserved word in strict mode.");
+                }
+            } else {
+                if (lexer_->GetToken().KeywordType() >= lexer::TokenType::KEYW_ARGUMENTS) {
+                    ThrowSyntaxError("Unexpected reserved word in strict mode.");
+                }
             }
 
             ident = AllocNode<ir::Identifier>(lexer_->GetToken().Ident(), Allocator());
diff --git a/es2panda/parser/statementParser.cpp b/es2panda/parser/statementParser.cpp
index ffa8688480bf9dd559572bc8f493b5feca1e6889..e6a022f4050c170c3ea0a0dcf2cf565746d0c1b4 100644
--- a/es2panda/parser/statementParser.cpp
+++ b/es2panda/parser/statementParser.cpp
@@ -1009,8 +1009,16 @@ ir::FunctionDeclaration *ParserImpl::ParseFunctionDeclaration(bool canBeAnonymou
         ThrowSyntaxError("Unexpected token, expected identifier after 'function' keyword");
     }
 
-    if (!isDeclare && lexer_->GetToken().KeywordType() >= lexer::TokenType::KEYW_ARGUMENTS) {
-        ThrowSyntaxError("Unexpected reserved word in strict mode.");
+    if (!isDeclare) {
+        if (Extension() == ScriptExtension::JS) {
+            if (lexer_->GetToken().IsJsStrictReservedWord()) {
+                ThrowSyntaxError("Unexpected reserved word in strict mode.");
+            }
+        } else {
+            if (lexer_->GetToken().KeywordType() >= lexer::TokenType::KEYW_ARGUMENTS) {
+                ThrowSyntaxError("Unexpected reserved word in strict mode.");
+            }
+        }
     }
 
     util::StringView ident = lexer_->GetToken().Ident();