Based on Fluent and Re normalization group (RNG) κ ε model, according to a comparative analysis of low rise hip roofed buildings surface pressure on the Japanese Tokyo Polytechnic University with the same size ratio. Simulation results show that the numerical simulation and wind tunnel test results are basically consistent, the feasibility is revifed that of numerical simulation methods. Based on this model, the changing of the length of the cornice and roof structure on the average pressure is launched a study. Impact of changes in the length of the roof cornice pressure distribution and the size is of more significant, and roof eaves angle changes directly affect the distribution of pressure, cutaway roof eaves can reduce the average pressure, this conclusion can provide reference for coastal wind and low building design.