A magnetic hysteresis telescopic integrated electronic water gauge was installed in the main channels of the Yuanhui Canal irrigation district to conduct automatic observation of channel water level,and conduct comparison test with manual observation of water level to verify whether the automatic observation data and its accuracy can meet the requirements of water level observation standards,and verifiy the reliability of automatic observation.The results show that the instrument has the advantages of high measurement accuracy,easy installation,stable and reliable working performance,which can be used to measure the water level of open channels in irrigation areas.