In order to promote the power generation absorption of new energy like wind/light energy, and realize the maximization of pitch peak benefit, economic benefit and environmental protection benefit of combined optimization dispatching of multi-source hybrid power bases, based on the analysis of time-space characteristics of multi-source hybrid power, we put forward a combined optimization dispatching model of multi-source hybrid power that takes the minimum of operating cost, wind curtailment volume, light curtailment volume and water curtailment volume of thermal power unit as the optimization goal, and provide a reference method for the sending system combined optimization dispatching of multi-source hybrid power bases under the background of ultra-high voltage power transmission. The example takes multi-source hybrid power bases in the Xinjiang region and in the eastern part of a region as study abject, which have significant temporal and spatial differences. Through the calculation and analysis of practical examples, the model is verified theoretically can promote the absorption of new energy and reduce the operation cost of thermal power units.