To solve the problem of ergonomic evaluation of suit production system, a Hybrid method with IAHP and gray entropy theory is proposed. Firstly, literature review about ergonomics evaluation tools and technology is introduced. Furthermore, the ergonomic evaluation index system of suit operation is established according to production practice. Besides, comprehensive evaluation model process with gray entropy and IAHP is introduced. Finally, detailed evaluation process of suit sewing, ironing and clipping operation is introduced by an example, and the results show that the evaluation method in the paper is helpful to verify the feasibility and effectiveness of the operation system improvement demonstration.