In this paper, a novel environmental comprehensive evaluation is proposed to solve the problems of Grid energy saving and environmental protection dispatching. The comprehensive value adopts the enthalpy entropy flow model which used to represent the thermodynamic cycle of the power generator. It is integrated four factors of coal consumption, energy saving potential, quantity of pollutant emissions and back water temperature, and then assigned with different weights. The best output scheduling scheme at the station of energy saving and environmental protection dispatching model is obtained by the classical evolutionary programming. Subsequently, the example of fifth unit of Hefei power plant analysis shows the possibility of developing the energy-saving, environmental friendly scheduling model based on grid security and reliability.