Based on the principle of water volume balance, by generalizing the surface water profile and Philip infiltration formula equivalent for Kostiakov model when infiltration parameter α=0.5, the model of synchronously determining Philip infiltration parameters and synthesis roughness according to the advance of border irrigation water was set up. The values of infiltration parameters and roughness were obtained under the different figure coefficient of surface storage σh, some research results and field experiments testified, by using the software of Matlab to solve the model. Then these parameters were confirmed, the results showed that synchronously determining Philip infiltration parameters and synthesis roughness were reliable. The study indicates that the analytic model has some advantages, such as simple calculation method and solution, higher accuracy.