In this study, interspecific relationships within plant societies of Cheongnyangsan Provincial Park were analyzed to establish basic data on vegetation communities that form the foundation of the natural ecosystem. A total of 100 quadrats were established in Cheongnyangsan Provincial Park to survey woody species. Species with a frequency of occurrence below 5% were excluded, and interspecific association analysis was conducted using the chi-square statistic. The results were visualized as a sociogram using Gephi 0.10, and network centrality and structure were analyzed. The analysis revealed that Lindera obtusiloba showed the highest frequency of occurrence, followed by Quercus mongolica, Fraxinus rhynchophylla, Q. variabilis, and Prunus spp. The Plants Social Network(PSN) of Cheongnyangsan Provincial Park, as analyzed, consisted of 61 nodes and 336 edges. On average, each species was associated with about 11.016 other species, and they were connected with an average of 2.165 steps. Modularity analysis divided the species into five groups: Group 1 included Parthenocissus tricuspidata and Schisandra chinensis; Group 2 included Celtis koraiensis, Philadelphus schrenkii and Acer pictum var. mono; Group 3 included Lonicera praeflorens, Smilax sieboldii and Ampelopsis glandulosa var. heterophylla; and Group 4 included Q. mongolica, Rubus crataegifolius and F. sieboldiana and Group 5 included L. obtusiloba.