In order to improve the efficiency of product development, based on the usability research of software interface, combined with Kansei engineering and algorithm, a series of methods suitable for the design of assembly process planning software interface are summarized. Through the function research and analysis of the assembly process design software, select the specific function icon, combined with the answer behavior analysis data obtained from the design survey, select the function icon design style suitable for the assembly process design software. The results show that the method can improve the steps and links of product assembly ability verification, planning and analysis of assembly process, and improve work efficiency.