Abstract: In response to the relevant difficulties encountered in the development of the Chang’E-5 high temperature water sublimation heat dissipation system (HT-WSHDS), a product quality management method of "dependability element construction and confirmation" was explored and practiced. The forward construction and confirmation of the entire system, all elements and whole process were carried out from three aspects of correct design, sufficient validation and process controlled. A series of approaches for achieving dependability elements were proposed. The on-orbit flight data show that the working performance of HT-WSHDS is consistent with the ground experimental results, which enhances the forward design, verification and process control capabilities of complex integrated equipment. It achieved the first successful application of HT-WSHDS on the lunar surface.