Abstract: Systematic investigations were made on the distribution range and damage degree of harmful species for walnuts by sampling survey method and fixed-point investigation in Yangting county,during 2017.The results showed that 5 species of diseases,13 species of pest,2 species of weeds were harmful to walnuts,and the main harmful species were Trijuglans hetaohei Yang,Alcidodes juglans Chao,Batocera lineolata,Xanthomonas jualandis and Marssonina juglandis.In this paper,an analysis was made of damage characteristics of harmful species,and the integrated control measures were put forward by strengthened investigation and forecast.