Abstract: The effects of heat treatment temperature on the microstructure,adhesion and hardness of electroless Ni_PPTFE are studied by the advanced analytic technologies such as scanning electron microscopy,X_ray diffraction and so on.Self_made multi_purpose friction and wear testing equipment and ultrahigh vacuum simulator are used to investigate the tribological performance and weldability of the coating.The results show that the Ni_PPTFE composite coating is cha_racterized by an amorphous structure,the complete crystallization occurs above 400℃,within the testing temperature,the hardness and adhesion properties of the coating will be improved following the increase of the heat treatment temperature,the wear resistant time is similar in atmosphere and vacuum,the cold weld will not appear in ultrahigh vacuum. The coating can be applied to the space environment.