Abstract:pine wood nematode disease , also known as pine wilt disease , is a destructivedisease , and is listed as an inter- national quarantine object. It is a kind of forest disease caused by pine wood nematode parasitic in the pine tree and feed nutrition , that can result in rapid death of trees . According to the occurrence and prevention of pine wood nematode dis- ease investigation from san Menjiang national Forest park during 2017to 2018, we have come the conclusionthat preven- tion and control of the disease should be“early detection of epidemic situatio , early planning , early action”. on the basis of strengthening the monitoring of the disease situation , we should do the plan intime , remove the dead wood and disease wood timely , tidy up the covers , take the pollution—free methods and spraying to control the Monochamus alternatus , strengthen quarantine to cut off the way of transmission .