This study aims to see the learner’s language proficiency of female marriage-immigrants through analyzing their free colloquial discourse. Language proficiency of the learners acquired by error analysis provides only partial information, and thus this study analyses inter-language of Korean learners in terms of ‘Mean Length of Utterance, MLU’ to see overall aspect of learner’s language proficiency more symmetrically. The analysis of vocabulary area is to enforce after generally studying the learner’s language development aspect in accordance with MLU-m(orpheme) and MLU-(w)ord found in compositions by Chinese speaking Korean language learners. In terms of MLU, it has been slightly increased as the level of proficiency between elementary level and intermediate level learners; however, the morpheme seemed to be difficult to use, since the difference between Chinese learners and Korean university students has been notably shown. Vocabulary diversity, using aspect for each word class, and using aspect of predicate are studied for vocabulary area; more various and numbers of vocabulary tend to be used as the level of proficiency is increasing. In terms of predicate use, Chinese learners use less number of vocabulary type. (Keimyung University)