Abstract: The key technique to differential quadrature method, i. e. the determination of the weighting coefficients, is investigated in this paper. The method of computing different weighting coefficients is developed on the basis of Lagrangian interpolating approximation. This method overcomes the limitation of rigorous restriction in choice of the coordinates of grid points in original method1, and proves favoradble for studies of fluid mechanics problems. Resultes obtained for solving unsteady boundary layers show that the differential quadrature method can achieve rather high accurate solution by using only a few grid points.

Key words: differentinal quadrature, unsteady, boundary layer