With the rapid development of the Internet, the model of online shopping is welcomed by the people. However, the problem of online reputation is gradually revealed. The problem of online reputation is becoming the biggest obstacle in the development of e-commerce. The article analyzed and summarized the research results of online reputation with researchers at home and abroad, combining with the actual situation of online transactions. It is to use the system dynamics to verify the factors that extracted from the network consumption behavior. Discussing the factors of online reputation is to build a good credit environment for e-commerce and meet the demand for the development of Ecommerce and the network economy.