In order to study the dynamic evolution laws of asphalt oxidative aging process，three binders were aged at different temperatures and aging periods.The master curve of complex modulus and phase angle of each binder were determined through frequency sweep tests by using a dynamic shear rheometer，and crossover modulus can be determined further.The dynamic evolution laws of crossover modulus with aging time and temperature were analyzed.The oxidation dynamic model which can predict the crossover modulus was established.It is found that the growth rates of the inverse of log crossover modulus are fast at the beginning aging time，and then gradually get slow to linear for both of unmodified and modified binders.The model can predict the crossover modulus of binders with aging time and temperature.Each binder has its own aging path with aging conditions.