Abstract: In ordered to solve the problem of afforestation difficulty in the in the northwest of Liaoning Province, the paper studied on the relationship between the arbor communities and environment, by DCCA, and used the Canoco software to processes the data. Through the analysis of the data, concluded that: between the environmental factors had significant correlation. The main factors affecting the shrub community distribution was the altitude, slope, slope positionsand soil type. According to the species and sample DCCA sequence diagram, could found that the arbor can be divided into five communities, and found the suitable growth environment of arbor community. Through the quantitative analyzed of the impaction between environment variables and species distribution, the environmental factor explained 45.3% of the vegetation pattern.