Abstract:Reporting key audit matters on audit reports increases the impact of CPA’s ability on the quality of audit reports.Taking the A-share listed companies that disclosed key audit matters of R&D from 2017 to 2019 as a sample,this paper makes an empirical examination and the study finds that R&D audit expertise of certified public accountants can affect the information disclosure characteristics of key audit matters and improve the information disclosure quality of key audit matters. Specifically, the higher the level of R&D audit expertise,the more sufficient, more relevant and more differentiated the information disclosed by certified public accountants when describing the reasons for listing R&D information as key audit matters.When auditors report the solution to the R&D key audit matters, they report more audit procedures, and the information is more adequate and more differentiated. The results show that cultivating CPA R&D audit expertise helps to improve the audit quality of R&D information and enhance the positive role of R&D information in the process of allocating innovation resources.