中文摘要：

XBRL报告的实施效果得到学术界的广泛关注。一些学者通过事件研究法发现，在强制报送XBRL报告后股价同步性显著降低。但是XBRL报告如何披露更多公司层面信息，相关研究没有给出直接证据。本文基于财务信息价值链视角，从XBRL分类标准视角寻找证据。研究结果发现，通用分类标准没有包含太多公司特质信息，其与股价同步性的相关关系没有得到验证；而公司通过自愿性扩展分类标准可以披露更多公司层面信息，扩展分类标准元素数量与股价同步性之间显著负相关。

英文摘要：

The Effect of XBRL reports has received extensive concern within academic. Using the event study method, some schol- ars found that the XBRL mandatory adoption significantly reduces adopters＇ stock return synchronicity. However, researchers do not show evidence on how XBRL reports disclosing firm-specific information. In this paper, we try to explain it from the perspec- tive of XBRL taxonomy, general taxonomy information elements mainly reflects the public information, while the extension taxon- omy information is more to reflect the firm-specific information. The results showed that the general taxonomy information does not contain too much firm-level information, its negative correlation with stock price synchronicity do not receive statistic prove; while the companies voluntary disclosing more firm-level information through extension taxonomy, the extension taxonomy infor- mation have an significant effect on the stock price synchronicity.