Abstract: In recent year, mobile recommendation system is widely used in various fields, while the privacy issues of mobile users are also highlighted, gradually attracting the attention of scholars. But the research on privacy protection technology is not mature enough. This paper based on the analysis of characteristics, structure and recommendation process of mobile recommendation system, described the personal privacy issues involved in the recommendation system, expounded the necessity of privacy protection and put forward the method of personal privacy protection in mobile recommendation system so as to take some advisements for mobile service.