Using azodiisobutyronitrile as initiator,a series of acrylic block copolymers were synthesized by solvent polymerization with allyl polyoxyethylene ether(APE),Alpha-Methylstyrene(AMS)and methacrylic acid(MA)as main raw materials.The structure of acrylic block copolymerization dispersant was confirmed by Fourier infrared spectroscopy(FT-IR)and gel permeation chromatography(GPC),and the relative molecular weight and PDI of the dispersant were measured.The effects of stoichiometric ratios of hydrophilic and hydrophobic monomers,relative molecular weight and PDI of dispersants on the dispersion efficiency of organic carbon black and inorganic pigment pastes and on the water resistance of coatings were discussed.The performance of the synthesized dispersing agent D3 was compared with that of the commercially available water-based universal dispersing agent.The results showed that the synthesized dispersing agent D3 was superior to that of the commercially available water-based universal dispersing agent,and its practical value was obvious.