Occupational mentality is an important component in the comprehensive structure of social mentality. It can be understood as a complex mentality that cross both of the public field and personal field and make profound influence on the psychology and behavior of workplace. Occupational mentality is also an important factor that have impacts on intention，persistence and performance of work practices. The present study explores the internal structure of social workers’ occupational mentality （SWOM） based on the dimension of communion. It is found that the internal structure of SWOM contains occupational personality，behavioral tendencies，public value and effective identity. The external validity of such structure is tested through four corresponding psychological scales among 178 social workers （or would-be social workers），so as to integrate the professional and psychological characteristics into social workers’ occupational mentality.