Thermal energy meter is a kind of instrument used to measure and display the released heat when the heat carrying liquid passes through the heat exchange system. The thermal energy meter is consisted of flow sensor, microprocessor and matched pair temperature sensor. The microprocessor gets the flow signal through flow sensor and the signal of water temperature at the entrance and exit from the temperature measuring circuit, and then calculates released heat by the heat carrying liquid according to the standard heat calculation formula. The thermal energy meter is designed and developed on the base of the European Standard EN1434 and OIML-R75 International Standard, and has high performance and flow energy consumption, and accords with the product standard CJ128-2000 Thermal Energy Meter issued by State Construction Department.