Abstract: Electrokinetic remediation is an effective method to remove heavy metal contaminants from groundwater. The effect of different voltage gradients (1, 2, 3 V/cm) on the removal rate of saturated zone groundwater Cr(Ⅵ) was studied with an initial content of 1 000 mg/kg for 4 days by the electrokinetic remediation method. In addition, the relevant factors in the repair process, including current, pH and redox potential (E_h) of anode and cathode electrolytes, and the concentrations of Cr(Ⅵ) in different positions were monitored. PH, the removal rates of Cr(Ⅵ) and E_h of the saturated zone medium before and after treatments were analyzed The results showed that: 1) The average removal rates of Cr(Ⅵ) increased with the increase of voltage gradient. When the voltage gradient was set at 2 V/cm, the removal efficiency and economy were better. The removal rate increase/energy consumption increase ratio was 0.52. The highest removal rate of 91.41% was observed when the voltage gradient was set at 3 V/cm, and the higher corresponding energy consumption was observed. 2) During the repair process, Cr(Ⅵ) would be enriched near the anode, especially when the voltage gradient was low (1 V/cm). The Cr(Ⅵ) concentration in groundwater near the anode after the reaction was up to 2170.95 mg/L, and the concentration of Cr(Ⅵ) in the medium was 1497.45 mg/kg, with negative removal rate. The concentration of Cr(Ⅵ) in the anolyte showed a tendency to increase first and then stabilize. When the Cr(Ⅵ) concentration was close to 4000 mg/L, it was close to the maximum migration value of the device. Increasing the reaction time had little effect on the recovery rate of Cr(Ⅵ). 3) The decrease of E_h and the increase of pH during the repair process would promote the reduction and desorption of Cr(Ⅵ), which could promote the removal of Cr(Ⅵ).