The structure of a gymnasium was designed and checked using “GSSAP”,which is a CAD software developed by The GuangSha Group. The structure was checked to meet the demands of 7 degree seismic intensity. The structure analyzing mainly consists of the checking of the horizontal force, the earthquake effect and displacement of structure with infinite plane stiffness. The overturning moment of earthquake was calculated along the azimuth as 0,90,180 and 270 degree and it turned out that the proportion of gross overturning moment and column overturning moment were both a hundred percent and met the commands of structural stability.