Due to the Extensible Business Reporting Language (XBRL) have high compatibility and other features, it is widely used in finance field, as an information disclosure and retrieval tool in the Shanghai and Shenzhen Stock Exchange at present. This article mainly uses normative research and empirical research to discuss the influence of XBRL on quoted accounting information quality. Firstly, this article theoretically discusses the positive effect on the relevance and reliability of quoted company's accounting information, which based on XBRL standard. This article brings into the concept of earnings response coefficient in the process of empirical research, and uses event study method to research the reaction degree of market excess return on unexpected factors of company's financial report. This article uses stratified sampling to select annual report disclosure information of 501 quoted companies in the Shanghai stock market from 2012 to 2015 and uses these samples to do empirical research. The results are as follows, unexpected accounting surplus has positive correlation with earnings response coefficient; the persistence of company surplus has positive correlation with earnings response coefficient; the growth rate of company has positive correlation with earnings response coefficient; the risk variation of company has positive correlation with earnings response coefficient. From the western accounting theory perspective, the earnings response coefficient is larger and the higher of accounting information quality. From the empirical research, to some extent, the implementation of XBRL made a positive effect on our country's quoted company's accounting information quality.