中文摘要：

与美国要求上市公司实施整合审计不同,中国上市公司还可以进行单独审计,即中国存在单独审计和整合审计两种不同的内部控制审计模式。理论上,整合审计可以降低审计费用,但缺乏经验证据。中国审计市场独特的制度安排为笔者研究单独审计与整合审计之间的差异提供了机会。笔者基于审计成本和审计质量视角实证检验了单独审计与整合审计两种模式之间的差异。研究发现,与单独审计相比,整合审计的审计费用显著更低;应计质量和内部控制非标审计意见在不同内部控制审计模式之间不存在显著差异。研究表明,整合审计提高了审计效率,降低了审计成本;单独审计牺牲了审计效率,但却未能提高审计质量。这意味着单独审计违反了成本效益原则,值得上市公司和监管部门关注和反思。

英文摘要：

The listed companies in US should employ their financial report auditor to express an opinion on their internal control. However,the listed companies in China can employ another auditor which is different with their financial report auditor. There are two kinds of audit models in the Chinese audit market： the separated audit and the integrated audit. However,there is little empirical evidence to suppport the integrated audit could spend less audit fees in internal control auditing in theory. This institutional arrangement of Chinese audit market gives us a chance to test the difference between the separated audit and the integrated audit. This paper compares separated audit and integrated audit based on the audit cost and audit quality. The research results show that internal control audit costs under integrated audit are significantly lower than thoese under separated audit,but there is no evidence that integrated audit are different with separated audit about audit quality. The separated audit violates the principle of cost-benefit which is worth concerning and rethinking for listed companies and supervision department.