Nowadays, with e-commerce developing by leaps and bounds, online reputation problem is one of the most important problems which need to be solved. The study of the impact of e-commerce participator on online reputation formation can provide decision basis for the parties and constraint their behavior. Through the definition of the e-commerce participator, studying e-commerce subject to find out which can affect online reputation formation to a large degree. This paper finds the influential factors by using literature theory analysis and the questionnaire. Via the construction of the six-dimensional factors index system of 24 quantitative indicators, design model of online reputation formation influenced by E-commerce participator. In empirical research, questionnaires be made again to collect data, the model has been revised 3 times to work out that it has 13 index with 5 parts. Finally draw the appropriate conclusions for each of the main effects on e-commerce online reputation formation.