The optimization design of the scroll plate with combined profile which is composed of base circle involute,variable radius base circle involute,base circle involute was studied. The geometric model of the scroll plate was obtained according to the characteristics of the combined profile and the formation method of the scroll plate. The mathematical model taking the stroke volume and area utilization coefficient as the objective function was established, then MATLAB genetic algorithm toolbox was used to perform multi-objective optimization of the objective function, and the comparison between the base circle involute scroll with the same number of scroll turns and the combined profile was analyzed.The influence of design parameters on the stroke volume and area utilization coefficient were discussed separately.The results show that the two objective functions values after optimization are improved compared with those before optimization, and are better than the base circle involute scroll plate. It shows the effectiveness of the optimization model and provides reference for the optimal design of the scroll plate with combined profile.