Abstract: Unified hydraulic system is composed of pump stations and pipelines, energy consumed by pipelines must be fitted with that provided by pump stations, the energy balance equation, which is starting point of analyzing problems concerning transportation in pipeline.Conventional energy balance equation, in which district computation is required and approximate formula is used, is abandoned.Based on the Colebrook formula, a set of new and serial energy balance equations of batch transportation is proposed, and its solving method is proposed too, and operation and maximum flow allowable rate can be computed more accurately.