传统有限元的研究，要求对区域的剖分满足正则性条件。
The researches of classical finite elements need the meshes of triangulation satisfying the regular condition.
本文在一个正则性条件下，给出了渐近最优EB估计的一个充要条件。
In this paper, we have given a sufficient and nfcessary condition for the asymptotic optimum EB estimate on ceatain regular condition.
利用各向异性单元分析方法得到了二阶问题的误差估计，从而避开了正则性条件的限制。
Using the analytic method of the anisotropic element, error estimate for the second order problem is obtained without the limitation of regularity conditions.
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