Abstract: The poor solubility of hydrophobic associating polymer is the bottleneck for further improving the oil recovery by means of polymer flooding in offshore oilfield. In this paper, effects of temperature, salinity, stirring speed, impeller type and stirring method on the dissolution of polymer were investigated. Dissolution time and solution viscosity of hydrophobic associating polymer were measured. The experimental results show that high temperature and speed are favorable to improve the dissolving rate of the polymer, but unfavorable to the increase of polymer solution viscosity. There is an optimal salinity range for the dissolution of polymer. Impeller with low shear stress and large circulation flow rate is suitable for the dissolution of hydrophobic polymer. The operation mode of uppumping and stirring speed changing from high to low can obtain a high polymer dissolution speed and a solution with high viscosity.