The kinetics of gellation reaction between amphoteric polyacrylamide(APAM) and water soluble phenol-formaldehyde resin has been studied. The whole gelation process could be divided into three periods:induction period, acceleration period and steady period. The accelerative increase period ranged in 3～17 days determines the incremental amount of gelling velocity and gel viscosity, and its gelling kinetics equation is η=η 0+kt 0.9(25 ℃). There are two factors which are the doses of water soluble phenol formaldehyde resin as crosslinker and the molecular weight of APAM affecting the gelling velocity at temperature 40～70 ℃, the former is the more prominent. The gelling reaction rate constant k could be controlled in 1 57～3 13 Pa·s/d 0.9 for reaction of 0 4% APAM solution with 0 2%～0 8% resol as crosslinker at reaction temperature 50 ℃ and the gel viscosity being reached to the maximum values of 16 2～29 0 Pa·s.
