electrolytic ion earth pole are added with reversible slow release filling agent.

electrolytic ion earth pole are added with reversible slow release filling agent. This agent has characteristics such as water absorption, water release and reversion. When it absorbs water, it can absorb 100-500 times of its own water. When outer environment is dry and needs water, the water can be released completely so that the water is balanced for surrounding areas. This is reversible reaction which effective humidity inside the casing body is guaranteed and stability of earth resistance is ensured. By this method of icon water absorption and deliquescence, electrolytic ion is released effectively to surrounding soils so that the earth pole is acting like an icon production device so as to improve the surrounding soils to achieve the earth requirements. The outside filling agent of earth pole is creating chemical treatment for casing soils by the interaction of internal electrolytic icon filling agent to reduce the resistivity for casing soil. At the same time, a transition band is formed between release earth pole and soils so that contact area is increased between section area of earth pole with same efficiency and soils and contact resistance between earth unit and soils is eliminated and the electric field distribution in the soil is improved. The filling agent is good in penetration and can root into nuds and cliff gap so as to form a tree root network and increase the effusion acreage from soils.