Abstract: As the space of offshore platform is narrow and its bearing capacity is limited, a new polymer dissolution technology, on-line curing, is brought forward that dissolution velocity can be greatly accelerated by increasing specific surface area of polymer swelling-particles. The swelling and curing process of hydrophobically associating polymer AP-P4, as well as its rule, have been studied by micrography and weighting of swelling-particles in the lab. The relation between diameter of swelling-particle and dissolution velocity of AP-P4 was discussed theoretically. A technical assumption that compulsive shearing on swelling-particles can improve the dissolution velocity of AP-P4 was brought forward and proved by laboratory experiments. A set of on-line curing testing device has been developed, and the relation between times of cyclic filtrating and viscosity of AP-P4 mother liquor has been studied. The Experimental results show that the swelling-particles of AP-P4 has the characteristics of limited swelling, and mechanical-stirring curing in curing-tank can be replaced by on-line curing due to the compulsive shearing and cutting effects of screen mat in pipeline. At the same time, the total dissolution time can be reduced over 50%.