Abstract: In this article, the experimental results of response of the conductivity vs combined environment about RTV-Ⅱ paint and the 13-17 white thermal control paint have been given. The experiments show that first: the conductivity of RTV-Ⅱ almost drops by one order of magnitude every year from 1984 to 1986. Therefore, the change of charging state occures on its surface. second: the response of conductivity of 13-17 paint vs space vacuum is not obvious, but the response of conductivity vs electron and light irradiation is very large. Especially, there is a strong memory effect under light irradiation. It is expected that the charging phenomenon on the paint surface does not appear in orbit when the spacecraft goes into eclipse from sunshine.