In this experiment, Using sodium silicate, zinc sulfate, aluminum sulfate, chitosan to Synthesize poly-silicate aluminum zinc-chitosan, and optimizing the preparation conditions at the same time. .The result showed that the prepared PSAZ-CTS had best flocculation performance when n(Al+Zn)/n(Si)=1, n(Al)/n(Zn)=5, m(Al+Zn)/m(CTS)=4, pH=1.40, in the condition of 40 ℃ experimental environment. The turbidity removal rate of the water from Songhua river reached a high level, even at a low temperature had a better treatment effect. Finally, The morphology of PSAZ-CTS flocculant was observed by an scanning electron microscopy. Key words: flocculant；PSAZ-CTS；preparation；turbidity；chroma；SEM