This study discusses the impact of IT Governance on the routine operation and enhancement effectiveness, in the ERP post-implementation phase. At the post-implementation stage in which ERP system had been used to support the company’s operation, the company needs to arrange the governance of IT (IT Governance) to be effective for the company because overall ERP benefits can only be reached when the operating environment is supporting. Structure, process and relational mechanism are important aspects of IT Governance. This research is focused on the process aspect which is closely related to the value achievement of an enterprise. The influence of two factors related to IT governance processes were investigated, namely IT-business alignment and IT benefits management. The results of this study provides companies with some knowledge on how IT Governance, particularly the processes related issues, gives contribution to the effectiveness of routine operation and enhancement during the ERP post-implementation stage, and further the knowledge can be used to help the companies to gain most of the benefits offered by ERP implementation.