关键词: 分裂移位, 句类, 主语义块, 辅语义块, 主辅变换

Abstract: The Phenomenon of Noun Phrase Splitting and Movement (PNPSM) can be easily observed in nature language. The problem influences seriously the accuracy rate of the natural language understanding and the machine translation system. The HNC theory carried on processing with taking the main-auxiliary chunk transformation as the core processing way to this kind of phenomenon, and finally forms the related processing rules, and causes the computer to automatic diagnosis the sentence through the rules, and enhances the accuracy rate of the machine translation system. The article introduced the research results of the main-auxiliary chunk transformation, and how does HNC form the processing rules and supplies them to computer，from computational linguistics angle, in order to enhance the accuracy rate of the machine translation system.

Key words: splitting and movement, Sentence category (SC), main truck, accessorial truck, the main-accessorial chunk transformation