Abstract: Dastarcus helophoroides was released on willow trees in some parks of Nanjing City to parasitize on and to control Anoplophora glabripennis that severely harmed the willow trees, the parasitic rate and control effect were periodically determined. The results showed that the release of Dastarcus helophoroides could effectively control Anoplophora glabripennis both in the first and second year. The corrected parasitic rate of Dastarcus helophoroides could reach 35% one month after releasing in willow trees, and the corrected decline rate of Anoplophora glabripennis pest population was about 45%. The average parasitic rate of Dastarcus helophoroides on Anoplophora glabripennis was around 37% in the second year. The study showed that Dastarcus helophoroides could parasitize on pupa of both Anoplophora glabripennis (with 67% of parasitic rate) and Zophobas morio (with 85% of parasitic rate), but it could not parasitize on Bombyx mori pupa.