This thesis is to find out the variation of Park Mok Wol`s Poetry and his poetic spirit which changed his poems. The summary is as follows. 1. Mok Wol`s Poems are classfied into `Early period poems` which shows the poetic world of `Illusive Self-content` and `Late period poems` that seek after turth as the limited human being, His `Early period poems` are divided into two poetic worlds. One is shown in 『靑鹿集(Cheongrokjip)』 expressing the personal yearning for the idal world and the other in 『山桃花(Sandowha)』 describing `Self-contented Nature` His `Late period poems` classfied into three poetic worlds. One is strong pressure of life and death shown in 『蘭·其他(ran·Gita)』 ·『晴曇(Cheongdam)』. Another is expresses the orientation toward `Home` and `Mathernity` described in 『慶尙道(In Kyungsangdo Fallen-Leaf)』·『어머니(Mather)』. The other shows the overcoming of the vanity in life, which is described in 『砂礫質(Saryeogjil)』·『無順(Monsoon)』·『크고 부드러운 손(In big and Soft hand)』. 2. The change in Mok Wol`s Poems is charcterized by the periodic circulation of Troubles and Reconciliation. Despite the various changes of his poems, Mok Wol`s Poems have a consistent poetic spirit toward the reconciliation between Self and Universe.