The dynamic rheological test method was used to test the high temperature rutting factor of asphalt, combined with the time scanning and frequency sweep. The results show that the relative error of petroleum asphalt G*/sinδ measured between time scanning process regression analysis and field test is quite small. According to the formula of WLF equation and fitting method, the glass transition temperature（Tg）fitting was carried out. As a result, petroleum asphalt and simple modified asphalt show higher degree of fitting correlation and better result reproducibility compared with polymer modified asphalt with complex phase structure. The correlation degree between Tg and low temperature failure strain of the mixture is much better than ductility.