The paper analyzes the large-caliber self-loading self-propelled artillery system, the principle of the mandate and structure, can be a substantial increase on the three large-caliber self-propelled artillery firing rate of the program summarized and analyzed to choose the best solution to the transmission system has been designed With the main program of the ammunition has been designed, the structure of the design magazine of ammunition Guide has been designed to guide the design chain, to the design of speed reducer and motor of Select and identify the various components in the transmission of a fixed method, and the design of the gripper body, the system of three-dimensional solid Key words: self-loading system of three-dimensional solid model chain guide