Abstract: By the way of line survey and fixed sample survey,investigations were made of walnut diseases and insect pests in Sinan County. The results indicated that there were 12 plant diseases and insect pests found,including 2 diseases and 10 insect pests. In addition,a description was given of characteristics, harm and distribution and occurrence of 12 kinds of plant diseases and insect pests, and some prevention suggestions were also put forward for them.