本文采用事项研究的方法 ,考察会计盈余公告前后股票累计超额报酬率的变动 ,通过对样本分组配对 ,检验我国股票市场能否区别具有相同的每股收益但具有不同主营业务利润比重的会计信息 ,并对我国上市公司股票市盈率与主营业务利润之间的相关关系进行实证研究。 In this paper, we study the changes of accumulated excess return of stock before and after the announcement of accounting earnings. By pairing samples, we can test whether the stock market of our country can distinguish the accounting information with the same earnings per share but with the different proportion of the profits of the main business , And empirical research on the correlation between the price-earnings ratio of the listed companies in China and the profits of the main business.