Based on the questionnaire survey data of all A-share listed companies, this paper discusses the relationship between managerial traits and internal audit outsourcing. The results show that, if chairman is more risk-averse, or the organizational identification of internal auditor is higher, one firm is more likely to outsource internal audit. However, both CEO risk aversion and the age of internal auditor have a weak influence on the decision-making of internal audit outsourcing. Further research shows that the impact of chairman’s risk aversion, internal auditor’s organizational identification on internal audit outsourcing are more significant in non-state-owned enterprises or enterprises that attach importance to internal audit function. Only when internal control is weak, internal audit outsourcing is positively associated with chairman’s risk aversion. When internal control is strong, the age and organizational identification of internal auditor can affect the decision-making in outsourcing significantly.