Abstract: In order to make clear the dynamic character of soil moisture and evapotranspiration under bunch planting and plastic film mulching with soil on flat field (M) during the whole growth season,we did field experiments of studying different soil moisture and water use efficiency (WUE) of 0-100 cm depth from 2008 to 2010 year which were aiming to get the water consuming and supplying character. The experiments were designed of M and CK (bare cultivation),a randomized complete block with 3 replications,267.75 kg/ha seeds and 10 seeds per hole. The results shows that M is able to significantly affect soil moisture (SM) of 30-40 cm and 40-50 cm during whole growth and 30-50 cm at the stage of earing and grain filling comparing with CK. At the middle and end of grain filling,M could transfer SM from the layer of 50-60 cm to 0-30 cm and significantly move SM from 60-70 cm to upper layer. The SM in 70-90 cm had also been used as important water supplication in key growth stage. Under M condition,the SM in 0-90 cm could be used efficiently and is the most important water supply area. Analyzing the dynamic character of WUE and ET in 90-100 cm soil,we could infer that M can significantly affect SM below 100 cm soil. But the traditional cultivation (CK) couldn’t get the effect whenever and wherever. CK could use SM in 50-70 cm efficiently at the middle and end stage of grain filling,which led to quick and much water shortness. The SM of 0-70 cm is the main supplier of CK at the stage of grain filling instead of SM in 0-90 cm as M. During the whole growth stage,the general SM of M in 0-40 cm was higher than CK. M could significantly improve soil moisture from the middle and deeper soil layer to the upper as important water supplier at the key growth stage. M could highly improve yield by high WUE and efficient ET,which could enhance drought tolerant ability of winter wheat in rain-fed areas and save much water.