Abstract: Results of static and dynamic simulated test to purify the waste water containing silver by Ipomoea aquatica indicated, 1) Removal rate of Ipomoea aquatica to Ag+ is higher than removal rate to [Ag(S203)2]3-,or KAg+>K[Ag(S2O3)2]3-. 2）Relation between purification rate (R) to[Ag+(S2O3)2)3- and detention time (t) is R = AeB/t(B<0). Relation between purification rate of surface (Ps)and detention time(t)is Ps=AtB(B