文中给出了数据融合算法，并提出把数据融合方法应用于火电机组的在线性能计算中，使计算结果能更完善、准确地反映机组的运行状况。这种数据融合方法计算简便，可以反映传感器在空间或时间上的冗余或互补的信息，获得比有限个传感器的算术平均值更准确的测量结果，具有较高的可靠性，实际应用结果证实了该算法的准确性，可推广到其它具有正态分布特性测量结果的数据融合。-Paper gives the data fusion algorithms, and to make the data fusion method is applied to thermal power units of the line performance calculation, so that better results can accurately reflect the unit s operating conditions. This data fusion method is simple and can reflect the sensor in space or time redundancy or complementary information, a finite number of sensors than the arithmetic mean a more accurate measurement results with high reliability, the practical application of the results confirmed the accuracy of the algorithm can be extended to other characteristics of the measurement results with a normal distribution of data fusion.