Taihorina sp.of Castanea mollissima Bl.belongs to Homoptera of Cercopidae family which is key pest damaging Castanea mollissima Bl.,take adult pest and nymph to attract damage.Study and control test were conducted on its biological characteristic by adopting site-fixed observation,and method of painting dry with plastic wrapping.The result show that the pests occur 2 generations with eggs over winter in Enshi of Hubei,the eclosion dog period of nymph in May and July each year.The control effect performs soundly by using thoate-oxide by 2~5 times to dress and tie in basic part of the tree trunk.