In the age of big data，the value of data has become important for competition among all industries. Person-specific information is an important part of it. In recent years，there have been some problems such as illegal access to person-specific information，data leakage，data abuse etc.，Mobile applications have become the worst-hit area. The construction of personal information protection system with Chinese characteristics has been accelerated. This article raises the suggestions ensuring personal information security，such as to clarify the chain of personal information，to improve the awareness of personal information security，to coordinate security and development，to build a personal information protection system and to reinforce technical protection，ensuring personal information security.