Abstract: In order to improve oil transportation process and according to Chinese oil characteristics, the systematical experiments and tests have been carried out and some encouraging achievements have been obtained so far by the Pipeline Science Institute. It is pointed out that the rheology study of waxy oil and experimental measurement technology are the basis on the transportation process research and application, the results obtained in this respect are described. The research results, including the heat treatment transportation for waxy oil, development and application for depressant, as well as new transportation process, are introduced in the paper. The GY serial depressant which can substitute for the imports have been developed successfully. They are widely applied in oil pipelines. The comprehensive treatment technology of crude oil additives are successfully used in Chnia's eastern and western pipelines, and have made considerable economical and social benefits.