The stress analysis model of sliding vane which is the critical element in a compressor is put forward and dynamic analysis of the sliding vane has been done by Mat lab in this treatise. Through analysis and computation the forces transformation ranges of sliding vane in serial production are got out and variety regularities of forces are analyzed. Based on forced analysis frictional efficiency is analyzed and imitated. The relationship of compressor’s main design parameters with frictional efficiency is searched out. The results are significant for property analysis and optimization of compressor.