Abstract: At present, the tubings used for the gas cylinder tubes of tube trailers mainly have problems including poor wall thickness uniformity, obvious banded structure which may lead to increased risks of cylinder breaking, and big inclination of stress corrosion which may reduce the safety factor, etc. Based on this, "hot expanding + cold drawing + thermal treatment" precision cold drawing process is used in the trial production of gas cylinder tube of tube trailer. Hot expanding can reduce banded structure of tubings and cold drawing can improve the uniformity of wall thickness. After cold drawing, through large proportion of the plastic deformation, tube wall can break the original grains and fine grains can be obtained in the subsequent thermal treatment, which can reduce the inclination of stress corrosion and effectively improve the safety factor of gas cylinder tube of tube trailer, and the whole process is simple and flexible with strong operability.