Abstract: the hydraulic regulating system is a multiple input multiple output, fast time-varying and slow time-varying coexist, both nonlinear non-minimum phase system.Currently used in conventional PID control has been gradually cannot meet the control quality of large hydraulic unit, in order to ensure hydraulic unit can be more safe and stable operation, this paper USES the multi-model dynamic matrix control theory, as a kind of advanced computer control technology, it combines the advantages of intelligent control and adaptive control, through the model prediction, rolling optimization and feedback correction methods such as improving control effect, and the DMC control and PID control and single model carries on the analysis comparison, proved more model more advantage in the dynamic control in the hydraulic unit, to solve the problem of large hydropower stations in the hydraulic unit to adjust has practical significance.