Factors affecting the degree of perceived organizational support of staffs were analysed,and the corresponding evaluating index system was constructed.A fuzzy comprehensive model for evaluating the staff perceived organizational support of staffs was put forward through evaluating degrees and selecting weighted factors.Taking the migrant workers of an enterprise in Nanjing as a study target,the results indicate the accuracy and effectiveness of the model and provide a tool for enterprises to evaluate the perceived organizational support of the migrant workers quantitatively.