本文选取了山东莘县话中一个多义助词——“喽”作为研究对象。文章第一章简述了山东方言的概貌，依据语法功能和语法意义对莘县话中的“喽”进行了分类。莘县话中的“喽”可以分为三个小类，“喽1”具有准助词的功能，用在动词、形容词后构成结果补语；“喽2”具有完成体标记功能；“喽3”用在动词或动词短语后够成能可能补语结构。第二章着重阐述了准助词“喽1”的用法。“喽1”用在动词、形容词后作结果补语，多出现在把字句和祈使句中，表达命令的语气。“喽1”作结果补语时，语义相当于“完/掉/了”等。第三章首先对“喽2”能够出现的句法结构及句法特点进行了系统地描写，重点讨论了以“V/A+喽2+O”为基础结构，考察了“喽2”可以进入的句法结构及句法条件。在此基础上，根据戴耀晶的时体理论研究了“喽2”的时体表达功能，之后运用屈承熹的篇章语法理论从篇章角度对“喽2”进行了审视，认为“喽2”可以标记有界事件，指示顶峰事件。第四章重点讨论了能够构成可能补语结构的“喽3”的功能。首先描写了“喽3”能够进入的句法结构，在此基础上，对比了“喽3”与结果补语、趋向补语在相互转化上的条件，并且对比与现代汉语中“得”字结构在构成上的异同，另外，我们根据徐晶凝的情态理论对“喽3”所表达的可能情态进行了分析，认为其可以表达动力情态和认识情态。

This thesis is investigating “Lou” which is a polysemous auxiliary in Shenxian dialect .Firstly ,we sketched the profile of Shandong dialect .Then ,according to the grammatical meanings and syntactic functions ,we can classify the “Lou” into pre-auxiliary , perfective aspect marker and structural auxiliary.The essay introducted the “Lou2” and “Lou3” in detail chapter by chapter.Chapter Three, we focused on syntactic structure of “Lou” .And on the basis of tense and aspect theory of DaiYaojing, we research the tense and aspect functions of “Lou”.From the perspective of discourse grammar, we conclude that “Lou2” can be used as bounded event marker ,and indicate peak event.Chapter Four is mainly studied the predicate-complement structure of “Lou3”.At first, we described the syntactic structure of “Lou3”.Secondly, we compared the difference of “Lou3”and “De” structure.At last, on the basis of mood theory ,we conclude that “Lou3” could express epistemic mood and dynamic mood.