To investigate the ecological safety of transgenic Bt rice on the aquatic organisms in paddy fields,the effects of transgenic Bt rice on zoobenthos community in paddy fields in Xiangtan,Hunan Province were studied by using community methodology. In this study,the transgenic Cry1 Ab / Ac rice,Huahui No. 1( HH1 for short) was the Bt rice,while the non-transgenic parental rice Minghui 63( MH63 for short) was used as control and benthic animal community in paddy fields was used as a bioindicator. The results in...