Abstract:Effect of transgenic crops on biodiversity is one of important environmental issues Concerned experimental reports have been published recently It was reported by Xia Jingyuan et al that transgenic Bt cotton in field trial harms seriously the parasitic rate, emergence rate and quality of cocoon of Campoletis chlorideae and Microplitis sp ,and the dominant parasitic natural enemies of the larvae of bollworm ( Helicoverpa armigera ) Results on convincible experiments were published by e...