According to the survey data of forest resources in Beijing mountainous areas by CCA analysis,the relationships between distribution of forest landscape patterns and environment factors were analyzed with the help of ArcGIS.Results showed that in Beijing mountainous areas,exposure,position,and soil thickness were not the dominant factors controlling landscape pattern.The first impact factor of the landscape distribution pattern was elevation and the second was slope.Distribution of plantation was in low altitude,while the distribution of natural forest was in high altitude.This was the same as the distribution of the landscape type in the CCA diagram.