Abstract: The charge accumulation on spacecraft surface is a threat against its own life. The condition of surface charge Accumulation (SCA) is ruled by many physical parameters. But the electric conductie capability of space materials has the most important influence to SCA. Therefore, it is necessary to attempt to improve the conductance of spacecraft's surface materials. In this article, the measuremet methods of the surface and the bulk conductance have been discussed. The measurement results of conductance about seven spacecraft's surface materials at 10~(-3)Pa and the plots that the conductance of materials changes with vacuum have been given. In the end of the paper, these experiment results have been discussed.