The Old Qida and The Pu Tongshi are two conversation books which were written for Koreans to learn Chinese during Yuan and Ming dynasties. They have obvious colloquial characteristics and are relatively simple and easily to understand. The vocabularies in books are usually related to the daily communication and often are used to people’s daily life. This paper mainly studies the dynamic auxiliary“Jiang”utilized in the two books from its causing and grammatical functions, basical usages and characteristicst to its death so as to make a deep understanding of“Jiang”.