Abstract:Fifty-one different plant samples from Shiwandashan Mountain were involved in screening new compounds against mites through methods such as the immersion of leaf disks, the glass piece method and so on. In this process, the toxic activities of the 51 samples′ methanol extracts on female adult mite of and Panonychus citri Me Gregor were determined. The research results are listed as follows: 11 kinds of plants showed good toxic activities on Tetranychina hart（Ewing）female adults. They are Rhamnella crenata,Psychotria ruba,Mallotus barbatus,Derris glauca,Rhus silvestris,Sophora flavescens,Alangium kurzii,Gnetum panvifolium,Trachelospermum jasminoides,Clemalis crassifolia and Breynia fruticosa. Meanwhile,Trachelospermum jasminoides,Rhus silvestris and Cassytha filiformis L. exhibited good toxic activity on Panonychus citri Me Gregor female adults.