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To deal with the complex features of three tank water system, such as multivariable, strong coupling, nonlinear and no precise mathematical model, a new Dynamic Matrix Control (DMC) combined with fractional PID in multivariate conditions called MFOPID-DMC is provided. According to Lyapunov’s second stability theorem, it can be proved that the new algorithm has the stability of closed-loop system. The algorithm is applied to three tank water system and compare with fractional PID and DMC. Simulation experiments with three tank water system show that this control strategy has good control effect and gets rid of large overshoots from fractional PID and slow response of DMC to some degree. Simultaneously, the algorithms is of strong robustness and high precision control.and it can effectively solve coupling, no precise mathematical model problem et al.