Abstract: By studying the characteristics of discharge and the removing efficiency of HeGDC in the HL-1M Tokamak, we found that the electric field near the symmetric position of the anode section was very weak, and the depth of the cathodic potential fall was much larger than the free mean path of He ions,which lde to a serious reduction of removing efficiency.We pointed out that the using of multianodes asymmetrically in HeGDC could improve the removing efficiency.