The paper discussed the effects of the dosage of activated carbon, pH value, the adsorption time and other factors on the adsorption capacity of COD_Cr and the removal rate when using high-specific area activated carbon to adsorb COD_Cr in wastewater. The result showed the dosage of HSAAC has a positive relationship with effect of the removal rate of COD_Cr. When the dosage of HSAAC was 2.0 g·L^-1 and pH was 3, the removal rate was above 80%. Under the acidity condition, the treatment showed a better effect. COD_Cr in wastewater adsorbed by HSAAC mainly took place during the first 30 minutes. When the concentration of COD_Cr in wastewater was lower than 60 mg·L^-1, after the treatment, the residual quality concentration of COD_Cr adsorption performance was lower than the First Class of the National Standard of the Surface Water of Environmental Quality(15mg·L^-1). When HSAAC was regenerated with alkali, the regenerated rate for the first time was 94.22%, and for the second time was 86.9%. Overall, the high-specific surface area activated carbon has excellent adsorption performance and can easily be regenerated under the suitable conditions.