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There are many problems in the enhanced geothermal system used for dry hot rock thermal energy exploitation, such as high investment, high risk, working medium leakage, equipment corrosion, land subsidence, etc. Using super long gravity heat pipe to mine hot dry rock geothermal energy can effectively avoid these problems. In this paper, an experimental platform for super long gravity heat pipe is built. The suitable liquid filling capacity, stability of operation and heat transfer performance under different cooling water flow rates are studied experimentally. The possible causes are analyzed. The research shows that under the constant power, the suitable liquid filling amount of the heat pipe is about 40% of the total liquid filling amount of the evaporation section. During operation, compared with the conventional short heat pipe, the super long heat pipe exhibits strong oscillation, oscillation frequency and heating power and charging. The amount of liquid is closely related. At a constant heating power, as the flow rate of the cooling water increases, the power of the heat pipe increases first and then gradually becomes gentle. In addition, the heat transfer performance of the heat pipe under the extreme liquid filling amount is especially discussed. The research shows that under the extreme liquid filling amount, the gas column forms a certain height at the bottom of the heat pipe, and the heat cannot be transferred to the top of the heat pipe due to the continuous existence of the gas column. The experimental results preliminarily verify the feasibility about using the super long gravity heat pipe to mine hot dry rock geothermal energy and offer …