Abstract: Several problems have long existed in continuous preparation and injection of fracturing fluid with dry thickening agents. These problems include high labor intensity, dusting, non-homogeneity of the fracturing fluid (such as generation of solid particles and gel conglomerates of dry thickening agents when dissolving in water), and long dissolution time of thickening agents etc. A new concentrated oleic alcohol association polymer thickening agent was recently developed to solve these problems. The new thickening agent is made of liquid paraffin, methanol, hydrophobic association polymers thickening agents and dispersant, and has good stability and mobility. In laboratory testing, this new thickening agent, a non-crosslinking polymer, dissolved completely in water in only 2 min, and no fisheyes have been found in the solution, making it possible to prepare fracturing fluid fast at well site. A fracturing fluid treated with 0.65% (mass fraction) of the thickening agent has a retained viscosity of 103 mPa·s after shearing at 150℃ and 170 s^-1 for 2 h. Compared with guar gum fracturing fluids, fracturing fluid prepared with the new thickening agent has better sand carrying capacity, lower friction coefficient (rate of friction reduction is 63.15%), less residue (less than 80 mg/L), less filter loss and lower formation damage (in dynamic filtration test, permeability impairment was 30%). Fracturing fluids treated with this new thickening agent have been successfully used in 8 wells in Block A, Shengli oilfield.