Given the continuous improvement of IT, the organizational information system moves from single department system to integrated organizational system, like the ERP system. Because of competitive commercial environment, the market of integrated system has developed quickly. It¡¦s important to apply domain knowledge of the organization when an information system is adopted. If the organization does not consider domain knowledge, it will bring less effect to the organization. On the other hand, the consultant company hopes the case be dealt with a package solution to save cost. Therefore, adjusting both sides becomes a critical way to reach the successful adoption. This study attempts using the view of knowledge transfer to investigate how enterprise and ERP consulting company to exchange knowledge. Computer efficacy will become the adjustable power to make two powers fit. Good computer efficacy will bring two advantages. One is to avoid too much customization. The other is to step away the package¡¦s type of ERP implementation. This study used deeply discussion to interview four adoption company and two consultant companies to prove the relation of knowledge transfer model. The result of study shows that apparently positive effect between interaction and knowledge transfer. The better knowledge transfer will provide the better quality of ERP system. The computer efficacy in the user company will provide balance in knowledge, avoiding the situation that the consultant company might be too powerful to lower the ERP system quality.