About author:WU Jing-zhu（1967－），male，native of Xihua，Henan，a lecturer of Zhoukou Normal College，M．S．D．，en- gages in finite element method； DUAN Guang-sen（1957－），male，native of Huaiyang，Henan，an associate professor of
Zhoukou Normal College，engages in applied mathematics.
