Abstract: This paper establishes an index system to evaluate resources-based cities'vulnerability，and uses improved PES-C model to evaluate yulin’s vulnerability from 2001－2011.The results show an optimal operating system while the value of vulnerability equals to the coefficient of mining stage，but in a critical state which，if broken，will be abruptly rising by losing stability.Therefore，in order to realize the sustainable development of resources-based cities，the value of vulnerability should approach the coefficient of mining stage from the left as far as possible.Yulin’s pressure index reached a certain height in 2011，far over flexibility’s loading limit，leading to a rising sensitivity. Hence，yulin’s follow-up is to decrease pressure and sensitivity and to increase flexibility.A scientific way makes sense to resources-based cities.

Key words: vulnerability, PSE-C model, resources-based city, sustainable development, Yulin

摘要： 构建资源型城市脆弱性评价指标体系，运用改进后的“压力－敏感－弹性” 条件模型（PSE-C模型）对榆林市2001-2011年的脆弱性程度进行评价。结果表明：1）当资源型城市的脆弱度值等于资源开采阶段系数时，系统处于最佳运转状态，但这种状态同时也是一种临界状态，一旦被打破，系统会马上不稳定，呈现出一种脆弱性爆发上升的趋势，因此，要实现资源型城市的可持续发展，就要让城市的脆弱性值尽量左趋近于资源开采阶段系数；1）榆林市的压力指数在2011年已经达到一定的高度，远远超出弹性的承载范围，同时，其敏感性也大量暴露出来，因此榆林市下一步要着力实施降压、降敏和增弹的措施；3） 确立科学的发展道路对于资源型城市的发展具有重要意义。

关键词: 脆弱性, PSE-C模型, 资源型城市, 可持续发展, 榆林