Abstract: This article describes the occurrence and damage of root-knot nematode including the species and dominant species in crop.The economic losses caused by them are also described.During 2010-2011,The damage of the root-knot nematodes of green house vegetable was systematically investigated in Inner Mongolia.The results showed that Meloidogyne incognite was prevailing in green house vegetable.The root-knot nematodes diseases of green-house vegetable occurred universally in Songshan,Hongshan,Yuanbaoshan and Ningchen of Chenfeng.Management measures for this disease were proposed.