Abstract: In order to find out the occurrence of walnut diseases and insect pests in Tibet and find out effective prevention and control measures, the disease types, damage degrees and distribution area of walnut diseases and insect pests in Tibet were systematically studied by using the outdoor investigation and indoor analysis and identification. The results showed that there were 4 kinds of main diseases in this region, and the pathogens belonged to 3 categories, 8 families and 8 species. 9 kinds of main insect pests were recorded, which belonged to 2 orders and 9 families. Diseases and insect pests, such as branch blight, bacterial black spot, brown spot and beetle, alcidodes juglans Chao, spring inchworm, and other diseases and insect pests had occured in a wide range and caused high damage degree. According to the characteristics of the diseases and insect pests and the results of control experiments, the comprehensive control calendar for main walnut diseases and insect pests in Tibet was formulated.