On the basis of mass unit matrix analytical method

taking thermal system of steam powergeneration unit as study object

a new method of feedwater enthalpy rise distribution in regenerative system has been put forward through vigorous mathematical deduction. By using the new method

the approximate behavior and hypothetical conditions in traditional method have been eliminated

and empirical correction factor needn’t to be adopted

making the calculation method to have more reality

and making the distribution result to be more objective.