In view of the problems that the selection and design method and calculation formula of crusher are mainly based on experience, lack of theoretical basis, and the calculation method of production capacity of semi continuous process system is inconsistent with practice. This paper systematically analyzes the key technologies in the type selection design and production capacity calculation of crushing station, such as the type selection parameters and production capacity calculation method of heavy plate feeder, the relationship between the maximum size of material and the diameter of crusher drum, the relationship between material moisture content, operation temperature and equipment technical production capacity, and the determination method of semi continuous process system utilization and effective operation time, The selection and design method of main technical parameters of double toothed roll crusher is improved. Based on the synchronization coefficient, the calculation formula of system utilization is modified, and a method for calculating the production capacity of semi continuous mining process system in line with the actual working conditions is proposed. Taking the semi continuous process system of self moving crushing station in an open-pit mine in Inner Mongolia as an example, the correctness of the results is verified, and ideas and methods are put forward to solve the problems or problems faced in semi continuous process design and practical application.