Abstract: Taking the Hebei Hengshui 78℃ temperature artesian well as a test high temperature well, we developed a Fluid Flow Observation System (FFOS) using the electromagnetic flow measurement method. The FFOS is self-developed system which can achieve data validation, acquisition, conversion, storage and access to China Earthquake Precursor Data Management System, also manage remote instrument. Installation and debugging of the FFOS in Hengshui well have repeated pipeline optimization, achieved the gas-liquid separation and solved the empty alarm. The observation data of the FFOS can intuitively reflects the stress changes of the well-aquifer.