中文摘要：

通过分析调和函数的临界点和等势线,证明了在非褪化的情形下,QED常数M2,2能被与边界有交的连续统达到,同时在1种褪化情形下,给出了M2,2的1个上界估计.

英文摘要：

By analyzing the critical points and level sets of harmonic function,it is proved that the QED constants M2,2 can be obtained by continua intersecting domain boundary in the non-degene-rate case. Furthermore,a upper bound for M2,2 in the degenerate case is given.