Abstract: Water and nutrient are key factors affecting growth and development of crops.It is helpful for high-quality and high-yield cultivation of crops to clarify rules of water and fertilizer requirements and their interaction.Because of extreme shortage of water resources in arid areas of Northwest China，drip irrigation coupled with water and fertilizer technology can accurately and evenly apply water and fertilizer to crop roots.Advantages of drip irrigation water fertilizer coupling technology and its effects on crops in northwest arid area were summarized.By expanding range of water and nutrient transport in crop root zone，drip irrigation water and fertilizer coupling technology is conducive to absorption and utilization of water and nutrients，and achieves goal of water saving，fertilizer saving，yield increasing and quality regulating.Advantages of drip irrigation water and fertilizer coupling technology are to improve water and fertilizer utilization efficiency of crops，promote high-quality and high-yield cultivation of crops，reduce field labor，and be conducive to development of healthy green sustainable agriculture.