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This paper aims at seeking reasonable power dispatching scheme for distributed wind-solar power generation hybrid system, to satisfy some basic requirements, such as dispersed electric power demand, electric power quality and reducing generation cost and so on. Firstly we represented some elements of the main parts in the hybrid system; and then made basic dispatching strategies according to different situations; then pointed out four improving measures to improve basic genetic algorithm, such as, (1). Modify the producing way of selection probability, (2). Improve the way of crossover, (3). Protect excellent chromosomes, (4). Change mutation range and so on. In the end, we try to solve the units commitment for dispatching plan problem based on the improved genetic algorithm, and the application seem proved it reasonable.