Abstract: 6-strain viruses have been isolated and identified from the naturally-diseased pests in forests in Yunnan Province,including Cyclophragma xichangensis NPV,Cosmotriche kunmingensis NPV,Lymantria mathura NPV,Diprion nanhuaensis NPV,Clostera rufa GV,and Gilpinia disa GV.It has been demonstrated that these viruses are the pathogenicity through infection of the orginal host.