Abstract:Atrijuglans hitauhei is the main fruit borer of Juglans regia . In recent years , it occurred seriously in yunxi county, resulting in serious yield reduction of Juglans regia . Through indoor observation and regular dissection of the de- velopment period of Atrijuglans hitauhei in walnut fruits, combined with field investigation and literature review in many years, The authors summarized the life habits and occurrence rules of Atrijuglans hitauhei in yunxi county, analyzed its outbreak reasons, and put forward some suggestions , such as selecting and popularizing varieties with strong resistance , strengthening scientific and standardized management of Juglans regia , strengthening pest forecasting and scientific pre- vention, in order to provide reference for the scientific control of Atrijuglans hitauhei in yunxi county.