Abstract: As a continuously promoting long-term national strategy， the reform of “streamlining administration， delegating powers， and improving government services” has fully aroused the enthusiasm of both central and local governments and realized the combination of top-level design and local initiatives， which has continuously released the reform dividends. As a new perspective of “streamlining administration， delegating powers， and improving government services” reform， efficacy evaluation effectively responds to the modernization process of the national governance system and governance capacity as well as the traditional evaluation perspectives， thus meeting the needs of practice and theory. The efficacy evaluation of the reform is based on the internal potentials and focused on the “three effects”. It emphasizes the dynamic connection between internal potentials and external effects. Based on a comparison of the results of the overall function and the sum of partial functions， the comprehensive monitoring of the reform process is completed， which can open up a new perspective on the evaluation of government reforms， relieve the vague perception of the nature of efficacy， and provide important theoretical guidance and practical follow-up for the continuous promotion of the reform.

Key words: “streamlining administration， delegating powers， and improving government services” reform; efficacy evaluation; internal potential; external effect