A drivetrain system, which delivers power and torque from power source to tires, is the key subsystem in a vehicle. In order to ensure that the system can transmit power smoothly under various conditions, the designed drivetrain system should be subjected to many tests to validate whether the operations and reliability meet the requirements. The testing is mainly divided into two phases: laboratory test and road test. The test items are planned according to working conditions of the gearbox. After passing all the tests, the drivetrain system can be installed in the vehicle for practical uses.