1. A feature code encoding method for anti-counterfeiting codes, which is characterized by: ① anti-counterfeiting code encoding: each batch of anti-counterfeiting codes produced by the encoding system has a set of corresponding feature codes; The security code is 16-2 1 digit, including enterprise code, product code, batch code and serial code. Each product can compile a set of clear codes, which will be encrypted into irregular anti-counterfeiting codes by encryption algorithm. ② Feature code: According to the above-mentioned anti-counterfeiting code coding method, when all the sequence codes are "0", the generated code is the feature code of this batch of anti-counterfeiting codes, and the plaintext code of the feature code becomes an irregular feature code after being encrypted by an encryption algorithm. ③ Storage of feature codes: After the encrypted feature codes are stored in the computer database, they are automatically decrypted into clear codes, which are stored in their respective tables according to enterprise codes, product codes and batch codes. No complete feature codes can be seen in the database. ④ Comparison and verification of anti-counterfeiting code and feature code: The anti-counterfeiting database provides query interfaces of various communication means such as telephone, mobile phone and Internet, and inquirers can input the anti-counterfeiting code on the logo in turn. The system decrypts the anti-counterfeiting code into plaintext code, and compares it with the enterprise code, product code and batch code information of the feature code recorded in the database. When it is confirmed that the anti-counterfeiting code information is consistent with the feature code information recorded in the database, the system will feed back the anti-counterfeiting code to the consumer. If it is inconsistent, it is counterfeit.