Abstract: Against the difficult problem of the transient temperature measurement, by using the radiation thermometry technology and contact thermometry technology combined method, we designed a transient high temperature measuring device which consisted of the blackbody radiation temperature sensitive body, the cylindrical metal housing of high strength and the signal conditioning circuit in the housing. Though the proper selection of thermal sensing thin film special material and the rational design of the overall structure, as well as using ANSYS software, we analyzed the transient high temperature heat conduction of the blackbody temperature thin film. Analysis shows that when temperature load of 2 000 ℃, 2 500 ℃, 3 000 ℃ applied, the temperature sensor response time was 487.001 s,545.001 s,590.001 s,respectively.This device can overcome the traditional transient temperature sensor shortcoming of bulky, slow response, inconvenience to install and susceptibility to harsh environment factors and so on. It has a good application value in the field of thermometry technology.