“Ba” construction has been one of the most discussed topics in Chinese linguistics and teaching Chinese as a second language(王1957,Li & Yip 1979,Huang 1982,王1984,Huang1990,1992&2002,黃1994,Hsu1996,李1996,Li 1997,趙、崔編著1998,旅1999,張1999,邵2000 ect.). In the previous studies, the types of verb-complement structures, the semantic features of the subject and the object of “ba”, the historical development of the construction, the process of acquiring the construction, or error analysis of the construction has been investigated. Nevertheless, none of them have done researches on the construction from a broader view, such as the discourse function of the “ba” construction, the interaction of discourse, semantics, pragmatics, and syntax. Furthermore, the language teachers found that their findings were not applicable to practical teaching. This study is based on the interlanguage corpus of English learners of Chinese, established by Prof. Teng Shou-hsin of National Taiwan Normal University in 1997. Only the data of elementary students of Chinese will be used in this study. I will first sort out all the data related to the “ba” construction, which includes sentences containing “ba” and sentences where “ba” should be used. Then I will analyze the acquisition of the “ba”construction of each of the 9 learners at the elementary level form both the synchronic point of view and the diachronic point of view I will then compare the acquired types of the “ba” construction with the erroneous types among the students, followed by an explanation on the nature of the “ba” interlanguage system of these learners. Next I will reinvestigate the “ba” construction from a broader view in order to reveal the real nature of the “ba” construction in a systematic and explanatory way. Finally, I will make suggestions on the teaching of the “ba” construction to the teachers.