Many companies regard Enterprise Resource Planning (ERP) system implementation as a project management (PM). ERP project implementation is usually costly and time-consuming. To save time and lower the cost, many companies seek for the help from consultants to implement ERP project. Therefore, the selection of ERP consultant turns out to be a key success factor to attain the goal. The ignorance of the various factors of ERP consultant selection will lead to a failure in ERP project implementation. In this study, we will examine the impact of ERP consultant selection factors on ERP project management and the impact of ERP project management on the performance improvement on ERP systems. In the study, ANOVA and Regression analysis were applied to examine the impact of the ERP consultant selection on the ERP project management, and the impact of the ERP project management in the DeLone and McLean's IS success model.