Abstract: Pine wilt disease is caused by Bursaphelenchus xyluphilus, which is the most serious and dangerous forestry disaster in China in the past 40 years. At present, the disease has caused a large area of pine tree death in 18 provinces and regions of China. Because of the difference of natural environment, the occurrence of pine wilt disease in different epidemic areas is different, especially in Liaoning epidemic area, where the average annual temperature is below 10 ℃. Compared with other epidemic areas, the cold tolerance of pine wood nematode is stronger in Liaoning epidemic area. In addition, there are new host tree species in Liaoning Province of northeastern China, such as Pinus koraiensis, P. sylvestris var. mongolica, Larix olgensis, L. kaempferi, L. principis-rupprechtii, as well as new vector insect Monochamus saltuarius. These differences not only bring more challenges to the control of pine wilt disease in Liaoning Province, but also increase the risk of epidemic situation continuing to spread further to the northern region. It will contribute to the research of pine wilt disease in Liaoning Province, and provide a theoretical basis for determining a set of effective control methods in accordance with the occurrence characteristics of pine wilt disease in Liaoning Province of northeastern China.