本文主要觀察在強制採用國際會計準則前後中國上市公司的資金成本的變化。藉由觀察中國上市公司資金成本的變化，作為評估未來我國強制採用國際會計準則後，我國上市上櫃公司資金成本變化的參考及比較依據。
　　目前相關的研究文獻大部分著重於探討強制採用國際會計準則與權益資金成本的關係，對於強制採用國際會計準則對債務資金成本的影響仍缺乏文獻支持。另外，大部分的研究文獻所選取的樣本為歐洲各國的上市公司，探討強制採用國際會計準則對歐盟的影響及經濟後果，卻缺乏探討亞洲各國上市公司採用國際會計準則的影響。
　　本文蒐集中國上海及深圳交易所A股上市公司2000～2009(2011)年為樣本。以2007年為分水嶺，觀察A股公司在採用國際會計準則前後資金成本之變化。
　　本文實證結果發現：(1)就權益資金成本而言，在強制採用國際會計準則後，A股上市公司之權益資金成本低於強制採用國際會計準則前。(2)就債務資金成本而言，在強制採用國際會計準則後，A股上市公司之債務資金成本低於強制採用國際會計準則前。

This study investigates the relationship between mandatory adoption of International Financial Reporting Standards(IFRS) and cost of capital of Chinese listed firms. We can evaluate and reference the changes of cost of capital of Taiwanese listed firms, after Taiwan mandatory adopting International Financial Reporting Standards, by investigating the changes of cost of capital of Chinese firms.
　　Most of prior researches focused on examining the relationship between manda-tory adoption of IFRS and cost of equity capital, but there’re a few of researches focus on the relationship between mandatory adoption of IFRS and cost of debt capital. In addition, most of prior literatures selected sample from listed firms of European Union, and investigated the economic consequences after mandatory adopting International Financial Reporting Standard. However there’re short of literatures looking into the economic consequences after mandatory adopting or converging the International Financial Reporting Standard in Asia capital market.
　　Using a sample of A-share listed firms of Shanghai and Shenzhen Stock Ex-change during the 2000-2009(2011) period. By comparing cost of capital of A-share listed firms during the 2000-2011 period, we observed the influence of Mandatory adoption IFRS on the change of cost of capital.
Empirical results indicate that (1) During the 2000-2009 period, because of con-verging with IFRS and the improvement of legal enforcement, A-share listed firms’ cost of equity is become lower as the time pass by. (2) During the 2000-2011 period, because of converging with IFRS and the improvement of legal enforcement, A-share listed firms’ cost of debt is become lower as the time pass by.

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