Unfavorable factors such as noise and unmeasurable disturbances are inevitable in the industrial field, which cause the fluctuations in the control variables of the controller and are not conducive to the actual control and long-term use of the equipment. At the same time, for valves that require large control action, it is impossible to accurately track and control when faced with small control action. For the above two problems, combined with the current industrial control target as the hybrid type with set point and interval, the dynamic incremental threshold and the static incremental threshold are introduced as the input resolution. When the constrained multi-variable system solves the optimal control law through the QP planning algorithm, for the dynamic threshold, if the control law exceeds the threshold, the control law is added to the input, otherwise the control law is ignored. For the static threshold, If the control law exceeds the threshold, the control law is added to the input, otherwise the control law is accumulated until the accumulated value exceeds the threshold, and then the accumulated control law is used. The simulation verifies that the strategy effectively guarantees the stability of the manipulated variable and solves the tracking control problem of the large control action valve.