Virtual Private Database (VPD) ensures the privacy of information and prevents direct data leakage through computer terminals by providing Fine-grained Access Control (FGAC). This paper firstly introduces the security requirements of the test database management system and based on which, further analyzes the existing shortcomings in access control technology. Through a brief introduction of VPD, the security design of the test database management system is then described, in which both the security and flexibility of the system are increased and the information leaks and other security related problems of the system are solved.