For many medium and small enterprises, ERP (Enterprise Resource Planning) has been a mature solution as a main application system. It is not only to support organizational internal operation but also business between corporations. However, this solution is usually complicate and expensive. Prior research has indicated that about three quarters of the attempted ERP projects turned out to be unsuccessful. A common problem encountered in adopting an ERP package has been the issue of project delay. In many cases, lack of project auditing is the main reason for project delay. This study proposes a methodology, enhanced from Wu (2008) and integrates it with auditing to address the above problem. The enhanced methodology includes eight steps: Implementation Plan, Monitor, Training, Operation Analysis, Solution plan, System tailoring to ready, Pilot Run, Officially online and efficiency evaluation. Three cases are used to demonstrate the usability of proposed methodology. It helps to identify and resolve the potential problems for each ERP implementation process systematically and thereby increase the probability of ERP implementation success.