Abstract: The (LP-DP) Linear programming-Dynamic Programming Proposed by Becker & Yeh first in 1974 is a powerfull model.But,it is not applicable to parallel system and not strict in terms of theory.The LP-DPmodel proposed in this paper is more useful and strict in terms of theory.It can be applied in all systems including parallel condition and has been successfully applicated in the real-time optimal operation in Jiang-Xi province hydrothermal power system.