According to the principal part of project demand, such as drawing Taohe water irrigation engineering in Gansu province, the distribution and area of afforestation land are discussed. The site type of afforestation land, proposes selection plans of afforestation plant seeds are analyzed, and a feasible afforestation plan in the light of the project special demand for afforestation is put forward by selecting afforestation plans comparatively. The demands and contents of afforestation engineering designs during feasibility study in soil and water conservation scheme are introduced more systematically.