With the increasing volume of E-commerce transactions in China, trust issue in E-commerce is increasingly prominent, which has been one major bottleneck of the sound development of E-commerce in China. This thesis aims to analyze the reasons for the lack of trust in E-commerce by starting with C2C E-commerce platform, and to analyze the main factors influencing the trust conduct of transaction bodies and put forward suggestions for improving credit system through the use of the static game theory.