Abstract: Abatract: Using Sap Flow System, the daily changes rule, seasonal changes rule and water consumption of stem-flux of the main crops-maize which was planted in oasis edge of the desert were tested. The results showed that the daily changes of maize stem-flux had a single peak curve at 14:00 pm and the peak value was 69.7303 gm/hr. The highest value of the daily changes of maize stem-flux occured in July (Mean Value) and was 68.71 gm/hr in the whole growth period. 67500 individual/ha of maize density calculating water consumption of stemflow, the peak period of water consumption of maize stem-flux was in June, July and August during the growing season, physiological water of three months for transpiration was 6478.2 m3/hm2. A total of physiological water in May and September was 160m3.The water requirement in the whole growth was 8878.2 m3/hm2, compared with the cultivation of medicinal plants-Astragalus in the same conditions, water requirement was more 4678.2 m3/hm2. In addition, stem-flux of maize and photon density(PFD), air temperature(Tair)，relative humidity(RH), vapor pressure deficit(VPD) of environmental factors had a close relationship. By regression analysis, the regression equation between maize and their impact factors were gained. This provides with the data basis of physiological water requirement of maize for planting maize in oasis edge of the desert.