由于公共预算压力,图书馆需要通过经济价值评估证明其存在价值。成本效益分析和经济影响分析是经济价值评估的主要方法,由于经济影响分析的局限,图书馆一般采用成本效益分析。本项研究论述了成本效益分析三种实施方法的原理,并基于国外图书馆成本效益分析的实证案例,对三种实施方法的效度进行比较分析。研究发现:①条件价值法、消费者剩余法和时间价值法的评估结果之间的数量关系;②条件价值法、消费者剩余法和时间价值法的效度排序;③推荐国内各类图书馆宜采用的评估实施方法。 Due to public budget pressure, libraries need to prove their existence value through economic value assessment. Cost-benefit analysis and economic impact analysis are the main methods of economic value assessment. Due to the limitation of economic impact analysis, libraries usually adopt cost-benefit analysis. This study discusses the principles of three implementation methods of cost-benefit analysis and compares the validity of the three implementation methods based on the empirical cases of cost-benefit analysis in foreign libraries. The findings are as follows: (1) the quantitative relationship between the conditional value method, the consumer surplus method and the evaluation method of the time value method; (2) the validity of the conditional value method, the consumer surplus method and the time value method; (3) Appraisal should be used to implement methods.