Introduces the structure and control method of gearbox tests. In order to meet the test's features of long cycle, labour-intensive and samples replacing frequently, the platform's control system adopts "IPC-PLC-Meter" and "PLC-Meter" variable structure model."PLC-Meter" as the basic configuration with terminal connection is used for bottom device control and data acquisition. IPC for process management and data processing connects with other devices through seriel conmmunication .