This research is to investigate the effects of audit innovation on sustainable audit success of CPA in Thailand by collecting data from 4292 auditors in Thailand by using a questionnaire as an instrument. The results of statistics used for analyzing the collected data were simple linear regression analysis and multiple linear regression analysis indicated audit innovation had positive relationships with audit quality and audit reputation. Especially effective of Modern Equipment Integrative of audit search technique and audit quality had positive relationships with audit reputation. Moreover audit quality had positive relationships with audit sustainable. The results obtained from this study could be used as guidelines for developing creating and improving the efficiency of auditor performance and practice audit process to create reliability to the public and to be able to survive sustainably in a long period of time.

External auditors often rely on other professionals for the audit of the financial statements of their clients. Generally. external auditors rely on clients internal auditors. Reliance on internal auditors results in cost savings to the client. The study uses a sample of 139 external auditors. The objective of this study is to investigate the factor on the considering on the work of internal auditor of external auditor. The results of factor analysis found that a measure of group factors for five groups: 1) communication 2) competence 3) Due Professional Care 4) Audit Quality 5) expertise. The results of the multiple regression analysis indicated that external auditors consider the competence and expertise of internal auditors as very important factors affecting their reliance on work of internal auditor. While the communication. Due Professional Care and Audit Quality not affect the considering work of internal auditor of external auditor.