Noted as a great splendid program,the three north shelterbelt p rogram is not only a pi-oneering work in China’s eco-construction,but also the important part of national eco-construction.Started in1978,the survival area of the program is accumu lated to be22.0372million hectares in23years,and the forest coverage h as been increased from5.05%in the beginning to9%up to now.The protection forest system in some key areas have been set up so stably that its ecological ,economic and social benefits have been improved greatly.The program has a bre akthrough from the traditional model into a multiple one,that is,the combinati on of belt,patch and net,the combination of artificial afforestation,aerial-sowing afforestation and closing hill and sand dune to facilitate afforestat ion,and combination of silviculture,prohibiting and managing,and thus enriche s the scientific connotation of the protection forest system construction.The f ormer50years of the21st century will be a decisive period for the program.S cientific achievements must be paid great attention to the program in order to s trengthen the construction pace and consolidate the program with suitable measur es.