With the improvement of overall system performance requirements

control problems in distribution process has already become the current research focus. The output of the object of microscopic distribution process are controlled by macro way

not can arbitrary shaped curves track with offset-free. This paper propose an offset-free model predictive control algorithm of controlling the distribution process. First

the method describe the distribution process with B-splines. Second

using composite trapezoidal rule for discretizing proposition of rolling optimization. Finally

using the quadratic programming method to calculate the offset-free target to achieve offset-free control. It proved well performed at simulation experiment.