Abstract: Flow pattern identification methods such as Baker。Brill, Beggs Brill, Taitel and SCA are analyzed, and S-T-B method to predict flow pattern, integrated with SCA, Taitel and Brill, is presented.This method is considered to be accurate in identifying flow pattern of gas-liquid two-phase flow pipeline through example validation, which can be taken as a method to identify flow pattern in calculation of oil—gas mixing transportation process.