This research will base on the number of auditors’ clients to measure the individual partner size for discussing the effect of audit quality on earnings management. From the previous literatures, we can find the earnings management would be different because of differential audit quality. However, the audit quality used to be measured by auditor’s industry experts, auditor tenure and audit firm size. It rarely uses the number of auditors’ clients as a proxy for audit quality. Therefore, this research will discuss the relationship between the individual partner size and the discretionary accrual. The result shows that the lead auditor has an apparent negative relationship with |DA|. It presents the more annual checking numbers, the less dependent degree to the specific clients because the auditors have the variety experience. And this situation can restrain the management office from preceding the earnings management more.