① UPC CODE
The United States firstly applied it in 1973 in the domestic business system.The code system is mainly used for business systems. The fixed code length is 12 digits

② EAN CODE
In 1977, the European Economic Community countries formulate EAN European Article Numbering Code in accordance with the standards of the UPC code .There are two types of EAN codes: EAN-13 code and EAN-8 code.

③ Interleaved 25 Code
Interleaved 25 Code is a variable length of continuous self-checking digital code system.
④ code 39
Code 39 is a discrete variable length letters self-checking code system.
⑤ （codabar）codabar code
Codabar is a variable-length discrete self-checking digital code system.
。It is commonly used in warehouses, blood banks and parcels management of air express
⑥ （Code128）

Code 128 is a continuous variable length alphanumeric code system.

⑦ China Post Code
China Post Express special code.
⑧ Other codes: Code 93, Code 49, Code 25, Code 11, Matrix 25
In the above code system, we often uses some as the followings
① UPC/EAN CODE
general merchandise barcode in China
5、Transmission technology
Transmission technology means transmitting bar code / magnetic card decoding information to the computer through data communications technology.Usually the transmitter is included in the decoder.

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