In this paper, a developed PSR model based on Chinese context is established to deal with the ecological vulnerabilities in western China. Judged by the model, we find that the essential way to pre-control the vulnerabilities is to evaluate it. Then a pre-control concept model is developed to evaluate and intervene the vulnerabilities. To carry out the pre-control model, we could use a series of evaluation equations to measure the single vulnerabilities, overall vulnerabilities, vulnerability changing trends, and the synergy degrees between the western ecological vulnerabilities and the performances of the local governments. Under the guidance of the evaluation results, the local governments and other organizations could choose the proper pre-control measures from the strategy matrix to respond to varied ecological vulnerabilities.