Abstract: The power distribution system laid inside the cave often has broken down due to moisture inside the cave and serious rust of the instrument parts,which seriously affects the continuous rate of the data.In this paper,it has been proposed that the distributor is moved from the cave to the office,the reform of the power distribution system of Chicken Seismological Station has been fulfiled by calculation and test.Since the reform,the instrument has been running well for two years.The problem which made the tiltmeter had frequent trubles for more that ten years has been completely solved.