This paper studied the fate of lead from metropolitan waste-water in model stablization pond system for pre-treatment lead toxicity to water hyacinth (Eihhornia crass ipes) and flocculation treated waste-water containing lead These could provide found mental data and scientific basis for the eco-engineering system of metropolitan waste-water purifying and resourcing. The results showed: In all stablization ponds for pre-treatment, the sedimentation process of suupended matter with lead was the major factor determining the removal of lead from metropolitan waste-water, When the theoeteal retention time was one day, lead could be removed effectively in the stablization pond for pre-treatment, and the removal efficiency of lead was 52～71%. It was favorable for the removal of lead if we seted up guide block or planted water-hyacinth in ponds. Water byacinth could absonb and accumulate lead from water very significantly even from the water containing low level lead But its tolerance to lead was low, not as many previous papers when the theoretical retention time (t) was one day and the lead level (c) in wastewater entered the pond wasn't over 1.0mg/l, the stablization pond intensified with water-hyacinth conld operate under normal condition. When water-hyacinth was planted in sueh a pond (t ≤ 1 day: c ≥ 1.0mg/l), for a long time, lead caused detrimental effects in water-hyacinth growth and physiology so far as to obvious visual toxicity sympton. Flocculation treated waste-water containing lead was a good method In the three kinds of flocculants (PFS、basic chloride aluminum and RS) we tested, the best one is RS made by ourself.