The purpose of this paper is to investigate phonological characteristics in Simunhakpa`s poems on the basis of syllable structure. That is, I divide the syllables of poem into onset, nuclear, and coda, then observe which phonemes are used frequently. The study of Simunhakpa sufficiently obtains a substantial argument in view of the literary theory. However, it is insufficient for the linguistic method. Poetry is based upon the relationship of similarity among sounds. Sounds perceived as similar to one another create acceptable rhythmic pairs. Because sounds are hierarchically arranged in languages, patterns in poetry can reveal the priority order within this hierarchy. So, with respect to the phonological patterns of Korean, I analyze all of Simunhakpa``s poems as to Yeongrang Kim, Yongcheol Park, and Jiyong Chung. At last I find the priority order of Simunhakpa`s poems within sound hierarchy. Most common are syllables with no onset and no coda pairs. With respect to acoustic features, the most frequent syllable utilizes the [+sonorant] feature. This pattern remains consistent over time.