Extracted water waste heat utilization is an important method for energy recovery,and heat metering instrument plays a crucial role in extracted water waste heat utilization project.The application of heat metering instrument in extracted water waste heat utilization project was introduced,the classification,selection,and installation requirement of heat metering instrument were analyzed,source of measurement error was investigated,and measure to control measurement error was proposed.The introduction provides reference value to the use of heat metering instrument,the reduction of measurement error,and the improvement of measurement accuracy and reliability in extracted water waste heat utilization project.