Abstract: Based on production practice, the ABAQUS explicit dynamic simulation platform was used to investigate the metal deformation and flow rule during tube continuous rolling by the Baosteel Ф140 mm full float mandrel mill. The results show that the transverse metal flow is mainly from the groove top to sidewall, and the longitudinal metal extension occurs chiefly in the groove top area, while the outer wall metal of steel tubes slides forward relative to the inner wall metal. Transverse metal accumulation and longitudinal inadequate extension in the groove sidewall area are the main reasons to cause non-uniform wall thickness.