近年來永續成為全球議題，企業陸續出版永續報告書，展現永續績效與作為，是聯繫利害關係人的關鍵工具。然而文獻指出，永續報告書缺乏重大性資訊、指標揭露程度不高、品質不一致等，提升永續報告書品質成為企業策略發展的重點。
本研究為了解建設公司永續報告書內容品質，以國內十家上市建設公司作為個案，採用個案研究及內容分析法，分析建設公司永續報告書重大主題與環境面揭露內容，亦比較國外五家公司永續報告書的內容。
依循全球報告綱領(Global Reporting Initiative, GRI)的要求，檢視永續報告書中重大主題的導出方法，重大主題與管理方針、特定主題及指標的連結。接著比較永續報告書索引揭露之環境指標，與實際檢視報告書揭露的異同，並依GRI指標的報導要求，分析環境指標的揭露程度，探討建設公司較多、較少揭露指標的原因。最後分析重大主題的連結、環境指標揭露，及其與環境和財務績效之關係。
研究結果顯示，十家公司重大主題平均揭露11個，較關注的主題有經濟績效、法規遵循、顧客健康與安全、職業健康與安全。蒐集主題多參考GRI準則的34個特定主題、同業標竿案例及國際趨勢等，鑑別重大主題多納入利害關係人意見。管理方針揭露不充分，其要求訂定的目標多為質化、不明確。十家公司重大主題的連結尚佳，特定主題連結率22%，指標連結率15%，連結率以社會面最高，環境面最低。
環境指標揭露數量與程度不高，平均揭露9個指標，揭露程度平均17%，揭露邊界多侷限於公司辦公室，工地資訊之揭露有進步空間。重大主題的連結與績效大多沒有關聯，財務績效不因環境資訊揭露而變佳，與文獻指出永續與績效之關係未有定論的結果一致。
本研究解析GRI準則規定，說明永續報告書編製架構，分析永續報告書重大主題與環境指標的揭露，突顯重大主題連結的重要，且提出環境面指標揭露的現象，有助於提升建設公司永續報告書的內容品質。

In recent years, sustainability has become a global issue. More and more companies publish sustainability reports to show their sustainable performances and actions. However, the literature points out that sustainability reports lack information of materiality, the disclosure level of indicators is not high, and the quality is inconsistent.

The objective of this research was to examine the quality of sustainability reports of ten domestic listed developers. Case study and content analysis method were adopted to analyze the material topics and environmental disclosures. They were compared with the contents of excellent sustainability reports of five foreign developers.

The results showed that the ten companies disclosed an average of 11 material topics, with more concerned topics including economic performance, compliance, customer health and safety, and occupational health and safety. For collecting topics, most companies referred to the 34 specific topics of GRI Standards, benchmarking cases in the industry, and international trends, etc. Most companies considered the opinions of stakeholders when identifying material topics. The disclosure of management approach was insufficient, and the goals were mostly qualitative and ambiguous. The material topic linkage with specific topics was 22% and linkage with indicators was 15%.

The disclosure amount and level of environmental indicators were not high. Each company disclosed nine indicators on average, and the average disclosure level was 17%. The boundaries of disclosure were mostly limited to the company’s office buildings without including construction jobsites. There was no relationship between material topics to indicators and company performance. In addition, higher environmental disclosures may not improve financial performance that is consistent with the findings of literature.

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