diff --git a/docs/fscript_crc.md b/docs/fscript_crc.md
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index 000000000..1096786eb
--- /dev/null
+++ b/docs/fscript_crc.md
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+## CRC 函数
+
+Cyclic redundancy check
+
+### 1.crc16 
+
+> crc16 函数。
+----------------------------
+
+#### 原型
+
+```
+crc16(str)
+crc16(data, size)
+crc16(binary)
+```
+
+#### 示例
+
+```
+crc16("hello")
+```
+
+### 2.crc32
+
+> crc32 函数。
+----------------------------
+
+#### 原型
+
+```
+crc32(str)
+crc32(data, size)
+crc32(binary)
+```
+
+#### 示例
+
+```
+crc32("hello")
+```
+
+### 3.cksum
+
+> cksum 函数。
+----------------------------
+
+#### 原型
+
+```
+cksum(str)
+cksum(data, size)
+cksum(binary)
+```
+
+#### 示例
+
+```
+cksum("hello")
+```
+
+### 4. 更多示例
+
+```js
+//test string
+assert(crc16("123") == 40116)
+assert(crc32("123") == u32(2286445522))
+assert(cksum("123") == u16(65385))
+
+//test binary
+a=typed_array_create("i8", 10) 
+assert(typed_array_push(a, 1,2,3) == 3)
+print(crc16(a.data, a.size))
+print(crc32(a.data, a.size))
+print(cksum(a.data, a.size))
+unset(a);
+
+//test binary
+assert(file_write("test.bin", "hello", 5)) 
+assert(file_exist("test.bin"))
+a = file_read_binary("test.bin")
+assert(crc16(a) == 13501)
+assert(crc32(a) == 907060870)
+assert(cksum(a)==65003)
+assert(file_remove("test.bin"))
+unset(a)
+```
\ No newline at end of file
diff --git a/tests/fscripts/demo_crc.fs b/tests/fscripts/demo_crc.fs
new file mode 100644
index 000000000..dbe8c76fc
--- /dev/null
+++ b/tests/fscripts/demo_crc.fs
@@ -0,0 +1,22 @@
+//test string
+assert(crc16("123") == 40116)
+assert(crc32("123") == u32(2286445522))
+assert(cksum("123") == u16(65385))
+
+//test binary
+a=typed_array_create("i8", 10)
+assert(typed_array_push(a, 1,2,3) == 3)
+print(crc16(a.data, a.size))
+print(crc32(a.data, a.size))
+print(cksum(a.data, a.size))
+unset(a);
+
+//test binary
+assert(file_write("test.bin", "hello", 5))
+assert(file_exist("test.bin"))
+a = file_read_binary("test.bin")
+assert(crc16(a) == 13501)
+assert(crc32(a) == 907060870)
+assert(cksum(a)==65003)
+assert(file_remove("test.bin"))
+unset(a)