Cau river watershed – Bac Kan province locates on the territory of four districts and towns: Cho Don, Bach Thong, Cho Moi and Bac Kan. The terrain there is high, mountainous, steep and dissected. In watershed area of Cau river – Bac Kan province, an area of 21,996.8 hectares of land is without forest (Bac Kan province, 2010). Scientific basis study and synchronization solutions for the rehabilitation operation and development of Cau river watershed protection forest on after shifting cultivation is limited, namely: lack of basis for classifying land standards after shifting cultivation according to natural rehabilitation potentials; lack of systematic study on protective role of vegetation cover on lands after shifting cultivation;