Firstly,a high-performance general three-element centripetal turbine torque converter with an effective cycle round diameter of 425mm was selected as a reference prototype to design a prototype with the same perfor- mance by means of similar-design method.Secondly,the cycle round and blades of double-impeller torque converter were obtained by segmenting the impeller blades of the prototype reasonably.Then,the structure of slip clutch was designed,and the main technical parameters of slip clutch and friction plate were determined.Finally,the designed double-impeller torque converter was calculated numerically by means of CFD (Computational Fluid Dynamics) method to obtain the capacity characteristics and the original characteristics under such three conditions as double working impellers,single working impeller and slipping.It is indicated by comparative analysis that the designed double-impeller torque converter can realize the continuity and controllability of capacity through slip control,so that it can be used to the variable capacity matching between loader engine and torque converter.