In this study, cellulose acetate (CA) / chitosan (CS) composite membrane was prepared by freeze-inducing phase separation (CIPS) method. CA and CS were used as fiber bottom and coating layer, respectively. After treating the CA/CS membrane (3.5 % CS) by liquid nitrogen directly, CS surface layer with micron-sized pores was obtained and the cross-section exhibited a thin layer with 1 μm. Pure water flux of CA/CS membrane could reach to 1.01×104 L/(m2•h). The permeate flux of acid blue could reach to 9.26×103 L/(m2•h), and the rejection rate was 98.6%. The adsorption process conforms to the pseudo-second-order kinetics and the Langmuir monolayer adsorption model. Furthermore, the adsorption capacities of membranes were investigated. It tended to be equilibrium in 30 min for dyes. The equilibrium adsorption capacities of membranes for acid blue, acid yellow, disperse yellow, and disperse blue were 92.10, 89.09, 85.03, and 79.62 mg/g, respectively.