With the wide use of precision marketing and personalized services, some of the market main body pays more and more attention to understand the consumers, they are motivated by profit to obtain and make use of its information of online consumers without knowledge or willingness. It violates the privacy of consumers. Although consumers can enjoy more convenient and personalized products and services, they also pay attention to the privacy of personal information protection increasingly. This paper summarizes the consumer privacy in e-commerce, and sums up the common way of consumer information collection in electronic commerce. Finally, the data mining technology and common algorithm based on privacy protection are summarized.