Abstract: The aims of this study were to analyze forest ecology security in Gansu Province, and to identify the main factors that positively and negatively affect the security of forest ecology. The ultimate aim is to improve forest management and the ecological function of forests in this region. Based on the Pressure-State-Response (PSR) model, we established an index system for the ecology of forests in Gansu Province. The security of forest ecology was determined by dynamic and quantitative evaluations using the entropy weight method and the ecological security index method, using data from the annual forest resource continuous inventory and the Statistical Yearbook for Gansu Province. The results showed that forest health has improved in Gansu Province during the period of 2006 to 2015. Also, a comprehensive evaluation of the overall ecological security of forest ecosystems showed an increasing trend from year to year, and the security of the forest ecological system has improved greatly. We discuss countermeasures and forest management strategies based on these results.