Abstract: Under the condition of the thin soil layer and low fertility in sandy soil, the experimental research has been done using irrigation on plastic film cover on peanuts cultivation． A distinct good result on watersaving and yieldincreasing was achieved compared with the normal furrow irrigation． It saves water by 27.3　%, improves water productivity by 76.9　%, improves soil utilization ratio by 16.7%, and increases yield by 34　%～68.5　%. This research also made deep discussion on its mechanism of saving water and increasing yield. 