In order to obtain the accurate characteristic curve of coal consumption quickly from a small amount of coal consumption test data

a method to determine the load impacted curve on generation efficiency of coal fired unit by utilizing two sets of data of coal consumption rate for power supply(hereinafter referred to as two-point method) is presented in this work. In this two-point method

dimensionless data of loads and coal consumption rate are adopted

and the general specific coal consumption curve is firstly obtained from units with various capacities and types

and then by translating the general specific coal consumption curve to go through the two sets of data of coal consumption rate

the specific coal consumption rate curve of the target unit is obtained

and the impacted curve of unit load on coal consumption rate for power supply is finally achieved. The two-point method is verified with the design and test coal consumption rates of 15 domestic main coal-fired generating units

and the result shows that the predicted deviation of the two-point method is –0.74%～0.65%.