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The cloud model is a mathematical representation to fuzziness and randomness in linguistic concepts, and integrates the fuzziness and randomness of a linguistic concept in a unified way. This model is a new method for transformation between qualitative and quantitative in the knowledge. In this paper, through analysis of the output of the nonlinear characteristics of PV cells the cloud model will applies to photovoltaic system maximum power point tracking control. The article is designed solar photovoltaic maximum power point tracking (MPPT) method based on cloud model. Simulation result shows that the cloud controller is simple and easy, directly perceived through the senses, and has strong robustness, better control performance, and good application.