Abstract: Described in the article are the experimental researches on both longitudinal and transverse wall thickness tolerances of the seamless steel tube as made overseas,and application of the tube Eccentricity Control System(ECS)in foreign pipe-rolling plants.Addressing the pipe-rolling process consisting of rotary piercing mill,full-floating mandrel mill and stretch reducing mill,it is pointed out that both the Crop End Control(CEC)technique of the stretch reducing mill and the Front-Tail Sharpening(FTS)process should be jointly employed.It is also emphasized that at present the R & D of tube-rolling technology should focus on the process technology itself and the auto-control software packages.