Promoting the modernization of national governance system and governance capability, namely promoting governance modernization, is an important project for establishing the dimensions of evaluation of governance modernization. The fundamental purpose of governance is good governance, and therefore there should be standards as well as specific goals for evaluating governance modernization. Based on the three dimensions of time, process and outcome, the evaluation of governance modernization is reasonable, feasible and pioneering. These three dimensions are mutually independent in terms of contents, and yet closely related.