一种求上近似约简的快速启发式算法.粗糙集（Rough Set，RS）理论是一种刻画不完整性和不确定性的数学工具，能有效地分析和处理不精确、不一致、不完整等各种不完备信息，并从中发现隐含的知识，揭示潜在的规律。-One kind of demand reduction on the approximation of fast heuristic algorithms rough set (Rough Set, RS) theory is a characterization of uncertainty and incompleteness of mathematical tools to effectively analyze and deal with imprecise, inconsistent, incomplete and other incomplete information, and discover hidden knowledge, revealing the potential of the law.