Abstract: The aim of this test is to acquire accurate thermal output of high temperature strain gauges,to stabilize the thermal output performance of high temperature strain gauge,to improve measurement precision of thermal stresses with resistive high temperature strain gauge and to suggest a method of clamping instead of welding for fixture of high temperature strain gauge for thermal output measurement.Thermal output parameters including parameters like thermal output of temperature rise and drop,thermal divergence,and thermal hysteresis are measured for resistive type strain gauge with an apparatus for measurement of parameters of high temperature strain gauges.Special clamp which uses clamping instead of welding was utilized to test the thermal output so that each strain gauge could be used again with a more stable performance,better precision and lower cost for engineering projects.The conclusion was that the thermal output of high temperature strain gauge was obtained,and the method of clamping instead of welding for thermal output test is feasible.