This experiment is based on the measurement of gravity acceleration by dripping water method,andthe self-made automatic water supply device is used instead of the faucet to make the experiment easier tooperate. The subtle adjustment of water drop speed is realized by using the subtle adjustment of spiralmicrometer.At the same time ,I found the best condition of the second drop of water when the first drop of watercame out by using the function of continuous shooting of the mobile phone.Finally ,the data were analyzed usingaudio processing software Goldwave, and the results were revised to take into account the effect of airresistance.The final gravity acceleration obtained has higher accuracy.