The flocculation procea can be described by flocculation kinetics．A silica pa rticle SuY,pensi(in was coag ulated with inorganic coagulants，and the flocculation kinetics was studled through easuring and anaIyzing the vari-ation of particle number during the floceuiation process The resuIts show that the flocculation kinetics；Ire lnfIu enced by the flocculation time. coagulant dosages and coagulant kinds，erc The flocculation process follows the first-order reaction in the beginning phase for about 10min; within the later time the flocculation process does NOT foBow the first-order reaction any nlore．With increasing coagulant dosage the floeculation rate inerease，and with the larger dosages the flocculation process goes on rapidly，deviating from the first-order reaction．The effective co-agulants Can improve the flocculation rate．