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This paper presents a new approach for the cross-directional basis weight control on paper machines. The multivariable control system with high-dimension is discoupled into several subsystems by introducing a new constraint on control variables to satisfy the computation and capability limitation of existing on-line control system. A block discoupling algorithm is developed, and a parallel control strategy is proposed to implement the control algorithm. Based on the strategy, a multiprocessors system is designed to realize the simulation. Simulation results show that the computational time can be significantly decreased and the real-time performance can be improved.