Abstract: The development tendency and applying technology of internal coating at home and abroad for gas transmission pipeline are introduced in detail, the rust removal of steel pipe and shop coating with spraying process and/or technology for newly-built large diameter pipeline are emphatically introduced, and a technological comparson in the application technology of internal coating of pipeline at home and abroad is made, which aims at speeding up the course of research on internal coating technology for domestic gas transmission pipeline, improves the manufacture level of internal coating equipments, and promote the popularization and utilization of drag reduction technology of internal coating for gas transmission pipeline in China.