Scleroderma guani is an ectoparasitic insect of some borer, especially the larvae or the pupae of longicorn. In Pingyi county of Shandong province, Scleroderma guani was found when it naturally parasitized Xylotrechus grayii in 1980. Passed more than ten years systematic studies, it has been found that this harpactophayeous insect has great boring ability and can be parasitize many hosts. In the fields to release Scleroderma guani for controlling Xylotrechus grayii, Phytoecia rufiventris, Anoplophora glabripennis etc. have achieved good results and kept steady effects. Therefore, spreading Scleroderma guani to control the borer is a new technology in sustaining plant protection.