Based on the site selection of Hunan rural housing with hilly terrain, the northern vegetation can shelter the house in flat area from cold wind in winter, and the natural ventilation in summer will not be influenced. It is useful for rural housing to improve the indoor thermal environment. The influence of different distances between the vegetation and the house were simulated in the section by CFD, and the optimal distance was obtained on the basis of the zero dimension pressure distribution on southern and northern wall surfaces. Then, the different widths of vegetation were also simulated in plane in the same way, and the optimal width was obtained. At last, the optimal design model of rural housing with vegetation was obtained, and the different requirements of natural ventilation in winter and summer can be satisfied simultaneously.