Abstract: The conidospores germination rates of biocontrol strain Paecilomyces lilacinus IPC for root-knot nematodes on the representative soil samples,which were collected from twenty four counties in Yunnan Province,were measured by soil palte method.The results show that there is all of the soil samples have fungistasis,but they are different for soil samples.The germination rates of PDB liquid culture conidospores is higher than that of PDA plate culture conidospores.The strain IPC fungistasis of the soil samples by respectively adding eight organic matters,seven antibiotics and six chemical pesticides were measured by using the same method.The eight organic matters respectively are corn straw,horsebean straw tobacco straw rice bran,oat powder,corn powder,soybean powder and fresh potato.The seven antibiotics are chloramphenicol,erythomycin,neomycin,kanamycin,streptomycin and penicillin.The six chemical pesticides are thiophanate-methyl,metalaxyl,aldicarb,carbendazim,phoxim and carbofuran.The results show that corn straw,horsebean straw,(tobacco straw),rice bran,seven antibiotics and six chemical pedticides can annul the fungistasis of strain IPC.