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This paper takes the current domestic chemical industrial parks support and develop photovoltaic (PV) plants as a research background, studies the modeling mechanism of the GM (1,1) prediction model in grey system theory, it systematically analyzes the irrationality of the stipulation of GM (1,1) model for the background values and initial values during the process of modeling of chemical industrial park PV plants power prediction. In order to improve the prediction accuracy of GM (1,1) modeldoi:10.3303/CET1867069 doaj:1350c0f9059f4e18901204f73742b0e5 fatcat:xrfinhjjebde7fkcay2l3ve7de