Abstract: For the sake of establishing the system of similarity safety psychology to improve development of safety psychology, on the basis of the theories of similarity science, safety psychology and safety science, a definition of similarity safety psychology was put forward, its connotation was analyzed,and the research significance of similarity safety psychology was explained. The subject foundations of similarity safety psychology were analyzed, the concept system and research levels were constructed, the application field and example of similarity safety psychology were analyzed. Based on study objects scope, state and nature of similarity safety psychology, the dimension system of quantity, category and nature were put forward. The research approach of similarity safety psychology was described from different perspectives. Research shows that similarity safety psychology is direct cross fusion of safety psychology and similarity safety to form a new branch of safety science, the research aim is revealing the similarity phenomenon and principle of safety psychology.

Key words: safety psychology, similarity science, similarity safety psychology, three-dimensional structure, research approach