Abstract: Auxiliary steam-water system is an important part of thermal system of power generator networks.The calculation of auxiliary steam-water rate of flow on the influence of coal consumption rate has an important practical significance.This article proposed a new method of calculating auxiliary steam-water rate of flow on the influence of coal consumption rate.It is based on the unified physical model and mathematical model of the analysis of thermo-economics and has the aid of gradient operator to build a calculation equation about the influence of auxiliary steam-water rate of flow on coal consumption rate.This equation was based upon intensity matrix.By example-calculating of typical working condition,the article tested and verified the correctness of this model.By this method,this was no need to build an energy-balance equation and a mass balance equation of thermodynamic system and has other advantages,for example,the easy derivation,little amounts of calculation,high accuracies and universality.Then,it presents a new tool of auxiliary steam-water system quantitative calculation and reaching energy conservation and lower energy consumption of thermal power generator networks.