diff --git a/port/linux/test/parse-test.cpp b/port/linux/test/parse-test.cpp
index 5e1fe73fe..34f8d7965 100644
--- a/port/linux/test/parse-test.cpp
+++ b/port/linux/test/parse-test.cpp
@@ -1064,4 +1064,39 @@ TEST(parser, pop_by_str) {
     EXPECT_STREQ((char*)"3(>=)2", token1);
     EXPECT_STREQ((char*)"29", token2);
     args_deinit(buffs);
-}
\ No newline at end of file
+}
+
+TEST(parser, mm) {
+    pikaMemInfo.heapUsedMax = 0;
+    Args* buffs = New_strBuff();
+    char* lines = (char*)"a = a ** -1\n";
+    printf("%s", lines);
+    char* pikaAsm = Parser_multiLineToAsm(buffs, (char*)lines);
+    printf("%s", pikaAsm);
+    EXPECT_STREQ(pikaAsm,(char *)
+        "B0\n"
+        "1 REF a\n"
+        "1 NUM -1\n"
+        "0 OPT **\n"
+        "0 OUT a\n"
+    );
+    args_deinit(buffs);
+    EXPECT_EQ(pikaMemNow(), 0);
+}
+
+TEST(parser, self_inc) {
+    pikaMemInfo.heapUsedMax = 0;
+    Args* buffs = New_strBuff();
+    char* lines = (char*)"a += -1\n";
+    printf("%s", lines);
+    char* pikaAsm = Parser_multiLineToAsm(buffs, (char*)lines);
+    printf("%s", pikaAsm);
+    EXPECT_STREQ(pikaAsm,(char *)
+        "B0\n"
+        "1 REF a\n"
+        "1 NUM -1\n"
+        "0 OPT +=\n"
+    );
+    args_deinit(buffs);
+    EXPECT_EQ(pikaMemNow(), 0);
+}
diff --git a/src/PikaParser.c b/src/PikaParser.c
index 4a9c68aaa..b7387ce25 100644
--- a/src/PikaParser.c
+++ b/src/PikaParser.c
@@ -188,7 +188,9 @@ uint8_t Parser_checkIsDirect(char* str) {
     /* include '0' */
     uint32_t size = strGetSize(str) + 1;
     for (int i = 1; i + 1 < size; i++) {
-        if ((str[i - 1] != '=') && (str[i] == '=') && (str[i + 1] != '=')) {
+        if ((str[i - 1] != '=') && (str[i - 1] != '+') && (str[i - 1] != '-') &&
+            (str[i - 1] != '*') && (str[i - 1] != '/') && (str[i + 1] != '=') &&
+            (str[i] == '=')) {
             return 1;
         }
     }
@@ -510,8 +512,8 @@ char* Lexer_getOperator(Args* outBuffs, char* stmt) {
                                  "<=",  ">",  ">=", "!=", "==", "%=", "/=",
                                  "//=", "-=", "+=", "*=", "**="};
     for (int i = 0; i < sizeof(operators) / 4; i++) {
-        if (Lexer_isContain(tokens, operators[i])) {
-            operator= strsCopy(buffs, operators[i]);
+        if (Lexer_isContain(tokens, (char*)operators[i])) {
+            operator= strsCopy(buffs, (char*)operators[i]);
         }
     }
     /* out put */