Soil erosion in Jinsha river basin of Yunnan province is very serious, and the basin is one of the major regions of national ecological environment construction. Sloping cultivated land in the basin is the land type with the strongest soil erosion, and the engineering of returning sloping cultivated land to forests (and grass) is of great strategic significance. The existing problems of the current engineering of returning cultivated land to forests (and grass) in the basin are analyzed, and practical rationalization proposals on enforcing scientifically the engineering of returning cultivated land to forests (and grass) are put forward.