Abstract: The paper reviews the advantages and disadvantages of internal drag-reduction coating and DRA used to improvepipeline gas transmission as well as their economic benefit and prospects. The internal drag-reduction coating has been usedas a proved technique in long-distance gas pipelines at home and abroad with significant economic benefit, but its applicationis restricted by some handicaps such as large one-off investment, complex procedures, harsh operating conditions anduncertainty of coating service life. The use of DRA has won great favor due to its simple technology and wide applicability.However, as a technique which would be used in the future, it is still in the phase of research and development.