The aims of this research is to study various vegetation associations on Mount Salak. Sampling was done by using systematic sampling with random start. Cluster analysis was used to determine the vegetation association. The relationship between abiotic factors and vegetation association was analyzed using Chi-Square statistic. There are 5 vegetation associations at alliance 1, 6 associations at alliance 2, and 7 associations at alliance 3. Calcium, phosphorus content of soil, soil’s texture and slope direction are the abiotic factors that affected the association at alliance 1. Calcium and phosphorus content of soil, and minimum altitude of plot are abiotic factors that affected the association at alliance 2. Phosphorus content of soil and minimum altitude plot are the abiotic factors that affected the association at alliance 3. Key words: Mount Salak, vegetation association, cluster analysis, chi-square statistic - Wiharto, Muhammad (Forum Pasca Sarjana, 2012)