According to the addictive index method of marking,the addictive index (AI) of Cu2+and Cd2+to tadpole is 1.03,1.12 and 1.20 in 24h,48h and 96h,respectively. The results show synergism action.

• Cu~(2+)和Cd~(2+)共存对蝌蚪24h、48h和96h联合毒性的相加指数AI分别为1.；03、1