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Solar aided coal-fired power plants utilize solar thermal energy for coupling coal-fired power plants in various types by using the characteristics of different thermal needs of the plants. In this way, the costly thermal storage system and power generating system will be unnecessary while the intermittent and unsteady of power generation will be avoided. Moreover, the aim of large-scale utilization of solar thermal power and the energy-saving will be realized. With the deep analysis of solar aided coal-fired power plants, the contribution evaluating system of solar thermal power needs to be explored. Five common evaluation methods of solar contribution are analyzed in this paper, and a 600MW solar aided coal-fired power plant is studied by these five methods comparatively. Therefore this study will supply the theoretical reference for the future research of evaluation methods and the subsidy policy of new energy.