Abstract: The main oil reservoirs in the Tahe oil field are carbonate fractured-vuggy reservoirs. The distance bet-ween wells is very wide. In the early production period, artificial wellhead tests were used to obtain liquid level data. Affected by equipment number and operation, the test workload was large and the monitoring data processing was lagging behind. Artificial monitoring could not fully reflect the energy changes in well and the abnormalities of pumping wells in real time. Continuous on-line monitoring of liquid level was carried out, realizing the continuous monitoring and remote collection of liquid surface data. It provided full level data for the dynamic analysis of wells, determined production condition in time, adjusted working system, ensured efficient and safe production of wells, and achieved the goal of reducing energy consumption and maximizing the efficiency of wells.