中文摘要：

本文在有界区域和半无界区域上研究广义Kawahara方程的初边值问题，运用能量积分方法、不等式技巧和嵌入定理建立解的先验估计，结合压缩映射原理证明了在有界区域上整体正则解的存在性和唯一性；同时得到当时间趋于无穷时，解的L^2范数具有指数衰减性；并且在加强的初边值条件下，借助不等式技巧证得在有界区域上存在与有界域长度无关的整体正则解，以及在半无界域上同样存在唯一的整体正则解．

英文摘要：

In this paper, we study the initial--boundary value problem to a generalized Kawahara equation on a bounded interval or a half--line. The energy integral method, the inequality technique and the embedding theo- rem are used to establish a prior estimate of the solution, and the existence and uniqueness of the global regular solution on a bounded interval are showed by the principle of contraction mapping. It is proved that the L2 -- norm of the solution has exponential decay when the time tends to infinity. Furthermore, under a stronger con- dition on the initial boundary values, the existence of a global regular solution on a bounded interval which is independent of the length of the bounded domain, and the existence of a unique global regular solution on a half --line are derived.