Abstract: The match of diesel motor and torque converter is reasonable or not, which concerns the performance of their each function and the machine’s. We should analyze the properties of diesel motor and torque converter correctly and know clearly the causes that influence their common working point. We can take some measures such as choosing the converter’s diameter scientifically, changing transmission gear ratio, designing the structural parameter reasonably, distributing the power of motor,etc. in order to make the match of diesel motor and torque converter reasonable.