Abstract: The extracting solutions were derived from 83 tree species,and the repellent activities of them against white ants were tested respectively.The results show that there are not any white ants entering the chambers treated with 29 species of extracting solution after 24 hours.Considered with the factors of plant resource and the cost,18 species of extracting solutions having better repellent activities are selected primarily for the second selection test during one year.And 2 species of extracting solutions are selected finally and can be used to make new pesticides for kill white ants.Among those whose repellent activities are not obvious,based on their killing effects on white ants,the better ones are selected and can be used to provide the scientific bases in making new medicine for killing white ants.