A RNG k - ε model, the reynolds averaged navier-stokes equations (RANS) turbulence model, was added in software Fluent 6.3 to simulate the wind tunnel model of Tokyo Polytechnic University, it turned out that simulating results fit well with the wind tunnel test data. Then a detailed simulation analysis was performed for average pressure coefficient of two same low-rise gable-roofed buildings which at different angles of the downstream building. The results show that the average pressure coefficient of upstream building is hardly affected by the angle changing of the downstream building, and its surface pressure is close to individual building. But the downstream building is affected relatively clear especially the corner area of ridge at small angles. The results of the study have reference value for wind effect research of low-rise buildings.