In this paper, Biochar was prepared by using oxygen-limiting and temperature-controlled heat-control method from the waste of dark tea, and the factors in water affecting the adsorption of Cr(Ⅵ) by biological carbon were studied. The results showed that the Biochar has a significantly better adsorption effect on the Cr(Ⅵ) than on the waste of Dark Tea;the sample SW900 has the best absorption effect on the Cr(Ⅵ), at 97.02%;The best adsorption conditions are water temperature 25℃, pH value 1~2, adsorption time 5h, the optimal amount of dosing...