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A biomass anaerobic digestion mode system with uncertain parameters is considered. However, the anaerobic digestion process is a complex nonlinear process, and its precise mathematical model is difficult to obtain. The performance of the traditional control method is mostly dependent on the mathematical model of the controlled system. In order to meet the increasing requirements of the control performance, it is necessary to study and design the modern control. Based on the Lyapunov stability theorem, a novel strategy combining sliding mode control and neural network is proposed. Finally, simulation experiment proved the correctness and feasibility of the theory. [ABSTRACT FROM AUTHOR]