Since the promulgation of the “Double Reduction” document by the State，Beijing has been strictly implementing the central government’s decision and deployment，all primary and secondary schools have carried out reforms in all aspects such as the concept of school operation，the practice of education and teaching，teachers’ student evaluation，and the competence of school management. As a result，significant changes have taken place. After phase I implementation，the main goal of “double reduction” has been achieved with preliminary effect. In order to achieve the ultimate goal of “significant double reduction” within 3 years and the remark of significantly improved satisfaction from people，right after the middle of phase II implementation，it is of great significance to designate a third-party evaluation agency to develop a scientific and practical evaluation index system based on the spirit of the “Double Reduction” document and phase I implementation. The index system will serve as an important basis for the government to evaluate all schools’ implementation of “Double Reduction” policy，a guidance for instructing all schools’ implementation measures so as to deepen the internal reform in a targeted manner，and an important part of the education policy evaluation system to ensure the evaluation of the policy implementation process. The construction of the evaluation index system shall reflect the following principles：unified purposes and processes，unified stipulation and autonomy，unified quantification and qualification，and unified near-term and long-term targets. The index system shall be policy-oriented，operational，educational and systematic. As a policy tool，the evaluation index system will put forward higher requirements for the implementation of “Double Reduction” policy by different entities such as the government，schools，families and society，and will bring profound influence and changes.