The two-dimensional nonisothermal injection filling process of Polypropene melt was simulated using Polyflow software. The distributions of velocity, pressure, temperature and shear rate for polypropene melt in injection filling in the mould cavity were analyzed. Results show that changes of every physical variable in injection filling in the mould cavity are even. The temperature of the flow front is higher and the pressure is the least. The melt average pressure and temperature at different time were also analyzed. The melt average pressure increases while the melt average temperature decreases with the time. The effect of different injection temperatures to the flow fields of melt in the mould cavity was studied. The higher injection temperature can increase the melt average temperature and decrease the average pressure, which can decrease the viscosity and improve the flow. Numerical results are of great significance for injection machine mold design and injection molding processing parameter selection.