Abstract: The scientific quantification of loss of ecological service functions serves as a crucial technical foundation and a key step in determining compensation amounts for ecological environmental damage cases. By benchmarking against the national standard series “Technical Guidelines for Identification and Assessment of Ecological Environmental Damage”, this study systematically reviews the methodological framework and assessment indicators for quantifying the loss of ecological service functions. The research highlights three major challenges in current judicial practice: controversies over non-use value assessment techniques, divergences in legal application, and gaps in institutional coordination. The study proposes improvement pathways, including establishing a quantification selection matrix at the levels of standard guidance and practical operation, formulating practical guidelines for non-use value assessment, improving explanatory mechanisms for technical investigators and expert jurors in ecological and environmental damage compensation cases, and strengthening funding support systems for quantification work, thereby facilitating the effective translation of scientific conclusions on loss of ecological service functions into judicial opinions.

Key words: ecological service function, permanent damage, quantification of non-use value, contingent valuation method

摘要： 生态服务功能损失的科学量化是确定生态环境损害案件赔偿数额的重要技术基础和关键环节。对标《生态环境损害鉴定评估技术指南》系列国家标准，系统梳理生态服务功能损失量化的方法谱系和评估指标，指出我国当前司法鉴定实践中生态服务功能损失量化面临的非使用价值评估技术方法争议、法律适用分歧和制度衔接缺口等三方面困境。提出从标准指引和实践操作两个层面明确生态服务功能损失量化的选择矩阵；制定非使用价值评估方法的实践指南；进一步完善生态环境损害赔偿案件的技术调查官和专家陪审员解释机制；健全生态服务功能损失量化的资金保障体系等改进路径，促进生态服务功能损失量化从科学结论到司法意见的有效转化。

关键词: 生态服务功能, 永久损害, 非使用价值量化, 条件价值法