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Wastewater treatment exists strong nonlinearity, unsteady operation and other characteristics, traditional hardware transducer are with huge maintenance problems and make it extremely difficult to obtain water-quality index quickly and accurately, such as BOD. Concerning the concert problems, an online prediction model of water quality based on ensemble RVM is proposed. Firstly, set RVM as weak predictor and then use improved AdaBoost.RT to embody several weak predictor into strong predictor. The simulation experiments demonstrated that this online prediction model has higher precision, better generalization ability, and overcomes the less effectiveness and robust problem of single predictor induced by increasing abnormal points. Therefore, the proposed model can meet the requirements of online prediction of water quality of wastewater treatment process.