Context-based personalized service has been widely used in people's daily life, and in the continuous expansion of the scope of service applications. However, behind these personalized service experiences, there are hidden privacy issues that cannot be ignored. Therefore, the study of the protection of situational privacy is an urgent need to achieve. This paper analyzes the privacy model of privacy protection in mobile context, breaks through the narrow concept of current situation privacy protection, improves the theoretical basis of situational privacy protection, puts forward the new protection method of situational privacy, and tries to solve the theoretical basis of current situation privacy protection imperfect status quo, to promote the development of cryptography, network security and software security technology and the practical application of situational privacy protection methods.