Along with the large-scale release of transgenic crops, their possible ecological risks have been paid an increasing attention. The research on eco-safety of transgenic Bt maize was commented from the following two aspects: (1) Effect of Bt toxin produced by transgenic Bt maize on soil eco-systemResearches on the persistence of purified Bt toxin in soil showed that it could be adsorbed by or bound on soil surface-active particles rapidly, and remained its larvicidal activity. The adsorbed or bound toxin had...