A system and a method for prediction and analysis of energy consumption in a building based on cloud computing are provided. The system comprises: an acquiring unit, configured to acquire various design drawings and the corresponding design parameters of the building; a building model generation unit, configured to set up the building model of this building according to the various design drawings and the corresponding design parameters; a building energy consumption model generation unit, configured to simulate the building energy consumption model of the building according to the building model; a judgment and estimate unit, configured to judge if the building energy consumption model is reasonable and provide the judgment result. The method is corresponding to the system. The system makes full use of the virtualization feature (good compatibility) and the scalability feature (rich history data) of the cloud computing, completes the prediction and analysis of the energy consumption during the design phase of the building, realizes the maximum power-saving and consumption-reducing management, and thereby implements the optimum configuration of energy sources.
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