Abstract: In this article， we have test studied space solar near ultraviolet（UV）irradiation effect on the electrical property of ACR-1 white paint， and analyze the component and micromechanism of ACR-1 white paint by X-ray photoelectron spectrograph and quadrupole spectrometre， at last， discussed the electrical property change mechanism of ACR-1 white paint. Conclusion： the surface resistivity of ACR-1 white paint decreases with near ultraviolet irradiation， and has back effect in some extent when it returns in atmosphere. Decompose of ZnO， decrease of adsorb Oxygen and increase of oxygen vacancy are main causation of decrease of surface resistivity of ACR-1 white paint under near ultraviolet radiation.