『TongYun』 written by Chenjinmo is rhyming dictionary of YuanYin-TongYun which is a series of language philology with huge amount, published in 1714. Structurally, it stuck to 36 letter of Middle Chinese but tried to ideal natural sounds pursued by a author through new attempts such as modifying name of rhyme entry, improving fanqie and setting six hu. Although 『TongYun』 didn`t reflect fully aspects of real languages, it is showing indirectly transition status of languages in those days through attributed state of rhyme letter and combined state of Six Hu. This study aims to remove characteristics of Xiangshuxue contained in 『TongYun』 and investigate literary values of 『TongYun』 in histories of development of Early Mandarin Chinese by figuring out phonological system and characteristics of the 『TongYun』 through an internal analysis.