A numerical model of cold air drainage flow over a finite-length slope was presented and characteristics of airflow and impacts of some parameters (volume of vegetation, shape of slope, anthropogenic waste heat and roughness parameter) were examined. Relating to the influence of land use, a slope covered with vegetation has a large capacity of generating cold air compared with a bare slope. When the cold air flowed out from the area covered with vegetation into the artificial area, roughness parameter has an impact to its velocity and anthropogenic waste heat to its temperature. As a result, the importance of preserving the green tract of land in a hilly area was pointed out.
