Surveillance system is widely installed at public places which plays an un-substitutable role in police work, especially in criminal investigation. However, in-depth research is still needed to improve or evaluate the preventive capabilities of video surveillance system. In order to further explore the effectiveness of video surveillance system in crime prevention, the video surveillance psychological prevention area model was proposed combined with the actual field-of-view of camera. Meanwhile, a optimal intrusion path model based on evasive psychology prevention area was proposed from the perspective of illegal crime behavior. Through the research of this paper, it is expected to provide reference for the research on the prevention ability of video surveillance system as well as the crime prevention of by police.