Abstract: The relation of swelling capacity of polyacrylamide (PAM) on time in the solvents of different water - methanol proportionality of volume at room temperature was discussed. The relation of swelling capacity for cation polyacrylamide (APAM) and amphoteric polyacrylamide (AHPAM) on its aminating rate in 40℃ water -methanol solvents of different proportionality of volume was studied. Swelling capacity is balanced by water -methanol solvents of different proportionality of volume in a short period. If water -methanol proportionality of aminating rate is increased,the swelling capacity will be increased. At APAM aminating rate 30%-40% and AHPAM aminating rate 28%-85%, more phenomena of polymer particles were discovered.Non - homogeneous phase Mannich reaction kinetics of PAM or HPAM show that the swelling capacity of APAM or HPAM vary with water - methanol proportionality and aminating rate. If water -methanol proportionality is larger, the aminating rate will be larger under the same condition. For products of larger aminating rates,PAM or HPAM at the early reaction periods should be aminated in solvents of larger water -methanol proportionality, that at the late reaction periods should be aminated in solvents of smaller water - methanol proportionality, The largest aminating rate was 40% and 35% in these experiments.