Abstract: The flow earth-tide has been observed with observational system consisting of LW-150 flow sensor and CZ-1002 digital recorder at Lujiang artesian well.#br#Harmonic analysis has been made by using Venedckov method for the original data of observed flow for 7 months by taking theoretical value of earth-tide as theoretical value of flow tide.The kdy elements of tide wave are as fo llows: amplitude factor phase lag O₁ 6.17±0.08 -3.7°±0.7° M₂ 6.32±0.03 8.7°±0.3° The results show that the data of observed earth-tide are in high quality, The observational data indicate that the system has a very good long-term stability.