中文摘要：

条件价值评估法（CVM）是目前最受欢迎的环境资源价值评估方法之一,但同时也是争议最多的方法,争议的焦点围绕该方法的有效性和可靠性。影响CVM结果有效性的因素很多,其中范围效应是最重要因素。笔者归纳了研究CVM范围效应有关理论,并通过1个实际案例来验证CVM评估环境资源非使用价值时范围效应是否存在。研究结果表明：范围效应不是CVM普遍现象,并非由CVM方法本身的缺陷造成。

英文摘要：

Contingent valuation method（CVM） is widely used in environmental impact assessment,but it is also critical.Major criticisms of which revolve mainly around its validity and reliability.There are many factors impacting CVM results bias.In which,＂scope effect＂ is one of the main reason.The major objective of this paper is to summarize scope effect relating this theory issues and to investigate whether ＂scope effect＂ existing in this phenomenon.The result reveals that ＂scope effect＂ was not a universal matter for CVM and not deficient in something itself.