diff --git a/port/linux/package/pikascript/PikaStdLib.py b/port/linux/package/pikascript/PikaStdLib.py
index 0f87c7745..0a2ec2f96 100644
--- a/port/linux/package/pikascript/PikaStdLib.py
+++ b/port/linux/package/pikascript/PikaStdLib.py
@@ -31,6 +31,9 @@ class SysObj(BaseObj):
     def float(arg: any) -> float:
         pass
 
+    def str(arg: any) -> str:
+        pass
+
     def iter(arg: any) -> any:
         pass
 
diff --git a/port/linux/package/pikascript/pikascript-lib/PikaStdLib/PikaStdLib_SysObj.c b/port/linux/package/pikascript/pikascript-lib/PikaStdLib/PikaStdLib_SysObj.c
index fe049881e..ed31ea0e7 100644
--- a/port/linux/package/pikascript/pikascript-lib/PikaStdLib/PikaStdLib_SysObj.c
+++ b/port/linux/package/pikascript/pikascript-lib/PikaStdLib/PikaStdLib_SysObj.c
@@ -76,6 +76,27 @@ int PikaStdLib_SysObj_int(PikaObj* self, Arg* arg) {
     return -999999999;
 }
 
+char* PikaStdLib_SysObj_str(PikaObj* self, Arg* arg) {
+    ArgType type = arg_getType(arg);
+    Args* buffs = New_strBuff();
+    char* res = NULL;
+    do {
+        if (TYPE_INT == type) {
+            int val = arg_getInt(arg);
+            res = strsFormat(buffs, 11, "%d", val);
+            break;
+        }
+        if (TYPE_FLOAT == type) {
+            float val = arg_getFloat(arg);
+            res = strsFormat(buffs, 11, "%f", val);
+            break;
+        }
+    } while (0);
+    obj_setStr(self, "__strtmp", res);
+    args_deinit(buffs);
+    return obj_getStr(self, "__strtmp");
+}
+
 Arg* PikaStdLib_SysObj_iter(PikaObj* self, Arg* arg) {
     /* a MATE object */
     if (TYPE_MATE_OBJECT == arg_getType(arg)) {
diff --git a/port/linux/test/pikaMain-test.cpp b/port/linux/test/pikaMain-test.cpp
index 3ffc3596c..a42b8b6fe 100644
--- a/port/linux/test/pikaMain-test.cpp
+++ b/port/linux/test/pikaMain-test.cpp
@@ -573,4 +573,25 @@ TEST(pikaMain, str_add_print) {
     /* deinit */
     obj_deinit(pikaMain);
     EXPECT_EQ(pikaMemNow(), 0);
+}
+
+TEST(pikaMain, int_float_to_str) {
+    /* init */
+    pikaMemInfo.heapUsedMax = 0;
+    PikaObj* pikaMain = newRootObj((char*)"pikaMain", New_PikaMain);
+    /* run */
+    obj_run(pikaMain, (char*)
+    "a = str(1)\n"
+    "b = str(1.2)\n"
+    "\n"
+    );
+    /* collect */
+    char* a = obj_getStr(pikaMain, (char*)"a");
+    char* b = obj_getStr(pikaMain, (char*)"b");
+    /* assert */
+    EXPECT_STREQ(a, "1");
+    EXPECT_STREQ(b, "1.200000");
+    /* deinit */
+    obj_deinit(pikaMain);
+    EXPECT_EQ(pikaMemNow(), 0);
 }
\ No newline at end of file