Abstract: The thermo-mechanical coupling test of composite rudder surface structure is carried out,and the composite rudder surface is heated by modular quartz lamp radiation heating system. The loading push rod is used to apply the force load to the composite rudder surface. Because the front end of the loading push rod is deeply heated in the heating area,the high temperature will inevitably reduce the strength of the loading push rod. Therefore,the water cooling device is used in the loading push rod. The test results are of great significance for evaluating the bearing capacity,service life and safety reliability.