Abstract: Korla——Shanshan oil pipeline is China's first ordinary temperature transportation pipeline that crosses the region with discrepancy in elevation (1 665 m) and a pressure-reducing station is installed. A successful pigging operation of the pipeline was made in 1998. Through studying the law of wax deposit and laminating sedimentation of crude oil, the authors determinated the speed of wax deposit and the pigging period, which was very useful for the future pigging operation of the pipeline.