Persistent earnings are the focus of both theoretical and practical field. Based on the data of A-share listed companies on non-financial main board in China from 2008 to 2016, this paper studies the type of audit opinion and the content of audit report involving going concern, and uses the first-order auto-regressive model to test the relationships between audit opinion and earning persistence. It is found that firms which received modified opinions have significantly lower earnings persistence than those with unqualified opinions. If the audit opinions are distinguished according to the content of the audit reports, then we find out that firms with modified opinions associated with going-concern problems had lower earnings persistence than other firms. The results show that the audit opinion is informative， and can really convey important signals about earnings quality.