The chitosan powder is the low cost adsorbent that can remove the several dyes and metal from aqueous solution. For this study, the comparisons of adsorption capacity between Malachite Green and Navy Blue dye have been investigated to lead to effectively remove hazardous dyes for water treatment. The contact time shows the equilibrium time for all temperatures together with two dyes. It shows that the adsorption of Dye1 and Dye2 reach equilibrium time in 3 and 6 hours, respectively. In addition, the theories of Langmuir and Freundlich isotherms were tested to distinguish type of adsorption. For Dye1 and Dye2, the Langmuir isotherm model shows a better fit than Freundlich isotherms that presents a monolayer adsorption behavior for all temperatures. The maximum adsorption capacities of Dye1 and Due2 are 76.92 and 100 mg g-1, respectively. According to the result, it appears that chitosan can absorb Dye1 better than Dye2. In addition, the kinetic data show that adsorption between chitosan and these two dyes follows the pseudo second order.