The water uptake capacity of the chitosan film prepared solely with acetic acid water solution was only 212 g/g. While the ternary solvent system was used, it improved the water uptake capacity significantly. The maximum water up take capacity of the chitosan film (896 g/g) was achieved under the dioxane/DMSO ratio of 2.5:7.5 (v/v). It is nearly 3.8 times of the commercial diaper material (Huggins) with the maximum water absorption capacity of 238 g/g .The chitosan films in our study also exhibited faster rate of water absorbing and higher water uptake capacity than the pure chitosan(85% degree of deacetylation, same as our experiments used) film prepared solely with acetic acid water solution, in which it took 72 h to reach equilibrium and the water uptake capacity was only243 g/g