The experiments to transform slope land into terrace have been made in mountain and hilly areas of granite-gneiss. The results show that the narrow-level terrace which is built up in one time can easily control slope land,save on investment and achieve good benefits. Compared with the usual one in slope land of 5°and 10°,the aboveway can save on labour forces and investment by 25 percent and by 30 percent respectively. The narrow-level ter-race can enhance the benefits of soil and water conservation by more than 75 percent,the soil moisture by 15 to 20percent in rainfall season,the crop yield by 20 percent to 35 percent,and land utilization by 40 percent to 50 per-cent. The fertility loss on narrow-level terrace is little compared with that one on slope fields.