Changes in diffuser reflection ratio will directly affect the radiometric calibration results and exploration results of space ultraviolet remote sensing instruments in orbit. Build up a device to study vacuum ultraviolet radiation characteristics of diffuser by simulating space ultraviolet radiation environment

and carry out the researches on the vacuum ultraviolet radiation characteristics of AL + MgF2 diffuser for space ultraviolet remote sensing instrument. The experimental results show that

vacuum ultraviolet radiation accelerates the degradation of diffuser reflection ratio; diffuser reflection ratio has degradation at 160-300nm; the degradation value increases with the increase of radiation time; the degradation varies with linearity at 160-300nm and the rate of degradation differs with the wavelength. Analyze the factors which may cause the degradation.