The purpose of this study was to compare the tolerance of transgenic cotton expressing Bt Cry1Ac+ CP_4EPSPS gene to glyphosate in Xin Jiang Province.Two years results showed that the tolerance of transgenic cotton was better than control CCRI 49 to glyphosate.After spraying with glyphosate,the growth and development of the tolerance of transgenic cotton was not affected in seeding stage,while the control CCRI 49 had the adverse effect on individual plants and some cotton plants even death.Transgenic Bt Cry1...