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The non-contacting measuring method for heat power using Cylindraceous Gardon type Sensor is proposed in this paper to meet the requirements of heat power measurement of heat source in cylindrical shape. A experimental testing device has been constructed. A series of experiments were carried out, and the relationships of output temperature difference, heat driven voltage, and input heat power are provided using both least square method linear fitting and neural network fitting. The MATLAB software is used in the numerical investigation of the experimental results. The conclusion indicates that the Cylindraceous Gardon type sensor device could meet the demand of measure accuracy, and is feasible and practicable.