With the rapid development of transgenic plant,more and more attention has been paid to its ecological safety.Dual-toxin transgenic (Bt+CpTI) cottons and regular cotton were studied by ICP-MS to detect the concentration of heavy metals.The results showed that the sequence of concentration of heavy metals is root>leaf>stem in cotton;the transgenic cotton accumulated less Cd and As than regular cotton in all the organs;and the content of Cr in leaf and stem of transgenic cotton was lower than that in regular cotton, while the content of Pb was lower only in stem.All the data showed that the insertion of foreign gene (Bt) might change the absorbing dynamics of most heavy metal.The reason for this change should be studied further.