General flocculating mechanism and dynamic behavior of al base water clarifying agents are analysed and discussed in this paper.

And to make preliminary reasoning and analysis of flocculate mechanism, it shows that polarity composition of cactus plays an important role in the course of flocculating.

By putting magnetic particles, PFC and PAM into turbid water made up by kaoline to carry on magnetic flocculating, optimum parameters and mechanism of forming magnetic composite flocs were studied.