Two kinds of modified montmorillonites were synthesized from Na-montmorillonite, namely Ni-Ti-cross-linked-montmorillonite and Ni-Ti-organic compound montmorillonite. Some factors were examined in the experiments of Cr（Ⅵ）=bearing wastewater disposal. The feeding amount of modified montmorillonite, the pH of wastewater and the stirring time, and the Cr（Ⅵ）removal rate on three kinds of montmorillonites were studied. The results show that the removal rate of Cr（Ⅵ） on modified montmorillonite under optimized conditions has reached 87% and 96%, that the adsorption obeys Langmuir adsorption isotherm, and that the saturated adsorption amount and the Langmuir constant are 3.182?7 mg/g,8.554 3 mg/g and 3.500 7, 1.273 8, respectively.