中文摘要：

介绍了一种高精度的差分格式,其由向前差分格式和向后差分格式作加权平均得到,并给出了格式的截断误差,先验估计及数值例子。

英文摘要：

A high accuracy scheme was introduced.The scheme was built by using the method of weighted average for the forward differencing scheme and the backward differencing scheme.Truncation error,a priori estimate and numerical experiments of the scheme were given.