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The synthesis and properties of three kinds of hyper-dispersants are studied in this paper,which are non-terminated,carboxyl-terminated and polyethylene imine grafted poly(hydroxyl carboxylic acid) ester.The hyper-dispersants are synthesized by the materials of 12-hydroxy-stearic acid,stearic acid and polyethylene imine,which are used to improve the dispersion properties of nano titanium dioxide (nano-TiO2) in low-concentration resin solution system.The influences of hyper-dispersants on the viscosity and stability of the system are studied.It is found that polyethylene imine grafted hyper-dispersant has the best dispersion performance in nano-TiO2 dispersion system,and the optimal content of the hyper-dispersant is 4%.