Cassava is an annual crop on slopping lands. Low or no investment is as a traiditional practice of casava Vietnamese farmers. Therefore, in order to ensure sustanable cassava production, it is needed to apply some suitable techniques in cassava cultivation. Within the framework of Participatory Research for Development in the Upland Project (PRDU), a project managed by the International Center for Tropical Agriculture (CIAT), a trial on cassava erosion control at Hung Duc commune (Ham Yen district, Tuyen Quang province) was conducted in 2006 aimed at to find out the best practices for erosion control, improving soil quality and ensuring sustainable cassava production. The trial consists of 5 treatments without replicates: (l) Cassava monocultivation without hedgerows (control), (2) Cassava + 2 rows of Peanut + Tephrosia hedgerows, (3) Cassava + 2 rows of Peanut + Decobens Brizantha hedgerows, (4) Cassava + 2 Peanut rows + Ghine hedgerows, and (5) Cassava + 2 Peanut rows + Stylo hedgerows. Plot area is 50 m2, Cassava density is 1 m x 1 m with variety of KM94. Chemical fertilizers are 10 tons of cattle manures + 60 kg N + 40 kg P2O5 + 80 kg K2O. Trial result showed that: among 5 treatments in the research, net incomes of all 4 researched treatments are higher than the control from 7.23 - 16.91 million VND per ha. Of which treatment number 5 with highest root yield (33.0 tons per ha) and lowest soil lost 1.7 tons/ha), lower than the control (6.0 tons/ha), and its income is 18.88 million VND based on 33.00 tons of Cassava fresh root and 1.17 tons of Peanuts seeds and also providing Stylo for animal feeding.