Abstract: It was researched that the fertilizer effect of drip irrigation potato was applied urea ammonium nitrate solution（UAN）by the method of field experiment and laboratory analysis.Results indicated that：Yield of potato was increased significantly by applying NPK fertilizer,increased by 23.5%,18.3%,and 14.8%,respectively.Fertilization utilization efficiency of N,P,K were 46.0%,15.9%,53.7% on potato,respectively.Per tuber weight,rate of commodity and fertilize utilization were increased significantly by applying NPK fertilizer.Potato tuber starch content was decreased 1.04 percent point by applying nitrogen fertilizer,however,it was not influenced by application of UAN and urea treatment.