Principal component analysis based on ecological security evaluation of Yuxi city

In this paper, the PSR (Press-State-Response) model was used to establish the evaluation system of ecological safety, and the principal component analysis method was applied for the analysis of the status of ecological security and comprehensive evaluation of Yuxi City from 2005 to 2009. The results indicated that the pressure index showed an upward trend year by year, carrying out that the process of urbanization should be accelerated in the premise of population control; Status indicators also showed ascendant trend,reflecting that the government increased the investments in public facilities, economic development and environmental protection have been focused; Corresponding indicators also showed upward trend, indicating that the government made efforts to improve the environment.