Abstract: Ke-Du Oil Pipeline is the first long distance pipeline constructed in China and it has been operated in the condition of low efficiency since its completion Based on investigations, analysis and tests on how to thoroughly solve the problem of pipe wall waxing, this pipeline had been put into renovation in accordance with the requirement of pigging technology. As a result, pipeline has succeeded in addopting the pigging technology and has achieved the better economical and social benefits after its renovation. The experiences and lesson of this job have been introduced in the paper.