Abstract: The test is carried out in oasis irrigation area of hexi, and study the response of intercropping wheat photosynthetic characteristics during the water and fertilizer coupling condition. The results indicate that photosynthetic characteristics of three water coordinating fertilizer are better than others during the filling stage of intercropping wheat. They are 370m3/mu(irrigation quantity) 28kg/mu(fertilizer rate), 370m3/mu、42kg/mu and 450m3/mu、28kg/mu. Under different treatment with fertilizer and water, irrigation quantity (370m3/mu) combined with other treatments of fertilizer or fertilizer rate (28kg/mu) combined with other treatments of water showed not only good water saving ability but also good photosynthetic characteristics.