Online auctions have influenced our modern life extensively, and this phenomenon makes many online/physical retail stores have jumped into this shopping competition. My thesis study is based on information system success model and consumer satisfaction with online usage and added with price consciousness and network externalities two factors to conclude 3 resolutions that are suitable for online shopping/auction site: Use "Buy price "," Traditional online bidding " and " Bidding fee auction ". My study is using online questionnaire survey for social networking sites and bulletin board system. The results of the research indicate that consumers are most concerned about the impact of online auction site buying factors as "system quality", followed by "information quality", again as a "price-conscious" and "network externalities ". However, "service quality” is lowest one for the effect level. Except using regression analysis to verify the hypothesis, this study also used Pearson correlation analysis and ANOVA analysis to discuss the differences of the factors of those three kinds of auction models. Finding that the use of consumers in the Buy price are significantly difference in gender, level of education, contacts online shopping experience and the last time on Internet shopping time; Using Traditional online bidding of consumers on gender, level of education and contacts online shopping experience are significantly different; Bidding fee auction of consumers in age, education level, monthly income, monthly free to use the amount on Internet, the last time on Internet shopping time have significant differences. The businesses should consider consumer groups and set up the valued ethnic strengthen the impact of auction behavior factor.