Abstract: After comparative analysis on the construction mode of domestic and foreign agricultural product traceability system, an aquatic product traceability system architecture was developed based on the administrative supervision and Chinese situation. The key technologies of the aquatic products traceability were studied, including the aquatic products traceability code scheme based on administrative divisions codes，the decimal group compressed encryption algorithm of aquatic products code based on AES (Advanced Encryption Standard), the dynamic allocation technology of aquatic traceability code based on USB key. The mixed aquatic products label including one-dimensional code and two-dimensional code were designed. The results of application test in several provinces showed that the system could be easily installed and deployed, and the traceability code had the characteristics of easy input and high safety.