Under the trend of mandatory labeling of genetically modified (GM) food in international trade market, risk management and traceability of GM foods is meaningful. Based on the reality of the mandatory labeling of GM food, this paper analyzes the necessity of establishing a traceability system for GM food. The EU's GM food risk traceability system demonstrates a good sample in practice. The construction of traceability system for GM food in China could use the existing food traceability platform. The food traceability platform in China is compatible with subsystems for data connectivity.