Timeliness is one of the most important characteristics of the accounting information quality. Internal control audit influences the timeliness of annual report through improving the quality of internal control and audit efficiency. Based on the Shanghai and Shenzhen Stock Exchange from 2010 to 2012 as samples of 3894 listed companies, and by using the OLS and quantile regression, the paper makes a theoretical analysis and empirical research on the effect of the internal control auditing on the timeliness of annual report. The study finds: although the non-standard audit opinions of internal control, internal control defects and defects rectification can result in the annual report delay, generally, the internal control auditing promotes the annual reports disclosure of listed companies earlier. Quantile regression results show that under different time of the annual report disclosure delay, the influence of various influence factors on the annual report delay effect is different.