The stability of a reflector assembly for a space remote sensor is an important factor which has an influence on the imaging quality of the optical system. By taking the reflector for a certain space remote sensor as an example, the main factors which have influences on the stability of the reflector in its manufacturing process, including the supporting structure, assembling stress, thickness, solidification and temperature variation of the adhesive layer, are analyzed. In the actual manufacturing process, the corresponding solutions for the above factors are proposed. They are design of a flexible supporting structure, design of a micro stress assembling method and device for the reflector assembly, design of a reasonable adhesive layer thickness control and solidification process and setting of a temperature variation range. Finally, the mechanical test, vacuum thermal cycle test and temperature test are carried out. The test results show that these methods can meet the stability requirements of the reflector assembly.