Abstract: The aim of developing automatic evaporation station is to replace manual method to measure evaporation value. Through calculation and analysis of the automatic evaporation station in different periods, this paper shows that the accuracy of the calculated values of the automatic evaporation station is better than that of the manual ones when rainfall occurs. In addition, the influence of float type, water filling metering type, weighing type, acoustic and optical method and magnetic liquid level gauge on evaporation measurement is compared and analyzed . The comparison between the automatic measurement value, manual measurement value and liquid level rise value during the rainfall period of the trial operation, and the measurement station shows that the magnetic liquid level gauge can use data synchronization consistency to "self prove innocence", which can make the evaporation measurement error smaller. At the same time, it has the ability of self calibration. The antifouling and antifreeze design of the magnetic liquid level gauge enables it to be used normally during the thin ice time in the south.