AbstractErosion is a common problem of almost all watershed area in Indonesia, includes in the Ngrancah sub watershed. Efforts to control erosion based on the vegetation analysis is very important as vegetation has a significant role in reducing the erosion rates. The objective of this research is to study the clustering of ecological units based on the vegetation parameters to find out the most influenced vegetation factor in erosion control.Vegetation data were collected by establishing plots of 20 m x 20 m in the field to examine the canopy percentage and Shannon diversity index. Micro stat program was used for clustering. The research result showed that the canopy percentage is the most influenced factor to be considered in erosion control. The proposed erosion control was determined based on the vegetation parameters, soil fertility and erosion rates resulted that for each group required their own techniques to reduce erosion. The higher erosion rate requires more variety of erosion control techniques.