The no-rationality of the optimization of power matching on torque-converter with diesel engine for wheel loader was analyzed. Based on the hydraulic pump in accordance with the work of loaders, the loader was divided into three typical operating conditions. The satisfactory degree function in the optimization of power matching on torque-converter with diesel engine based on the generalized satisfactory degree theory was explored. Multi-objective optimization design of power matching on torque-converter with diesel engine was introduced, and the problem-solving steps and methods were given. The analysis shows that this method can improve the quality of the power matching.