QR code is 2-dimensional bar code. It is more advanced than bar code, which can only store numbers and characters. QR code can store numbers, characters (including Chinese characters) and even images. It has great data capacity and allows for error correction. It is commonly used to spread information and is sometimes used to achieve website login function. It can even be encrypted that the user has to enter password to get the original information. In my thesis, I come up with an idea that the QR code can be used to check genuineness of products. This is achieved by applying CRC32 algorithm, which will produce a checksum value according to the original information that we can perform check operation when we scan a product’s QR code and tell whether this product is verified. This is quite a practical implementation method because it is easy to operate.