Abstract: Radiant cooler mostly provides cryogenic working condition for the infrared detector.It is an important part of space infrared remote sensing detect system.The finite element analysis model of W radiant cooler has been set up.Thermal transmutation analysis of radiant cooler is done by ANSYS analysis software.The measure for minishing two cold head comparatively displacement is introduced.As a result of analysis,it offer a theory reference for the optimal design of radiant cooler and optics compensate of infrared camera.