拉格朗日均匀插值法显示Runge现象，后又改进使用了切比雪夫插值点，使得误差中的Wn+1值减小，消除了Runge现象。-Lagrange uniform interpolation Runge phenomenon, then improved using Chebyshev interpolation points, the cut makes error in the Wn+1 value decreases, the elimination of the Runge phenomenon.