Abstract: This paper summarized and analysed the conditions of potato late blight occurred in zhuanglang county and based on the practice of prevention and control in recent years,through the introduction and selection of the disease-resistant cultivar,the construction of no disease potato,and integrity the system of the late blight monitoring early warning system,we forecasted Scientificly forecast,we conducted the field control we？should？achieved？early？prevention,？and？early？treatment,Anti-prevent and Anti-rule;we persevered ＂Public Plant Protection,Green Plant Prevention and Control＂ for the concept,promoted the seed soaking with chemicals,crop rotation and change crops,put out the center of the disease,Finally,we took a series of comprehensive prevention for the prevention and treatment of the field control.