After half-a-semester implementation of “Double Reduction” policy，a survey on the implementation of after-school services in representative districts and schools in Beijing showed that the supply of after-school services has been stable，and the ratio of teacher-and-student participation is the highest in China. The goal of integrated development of in-and-after-class courses is made clear in the orientation of “five educations”. However，due to insufficient curriculum supply，lack of attractiveness，insufficient pool of professional teachers，heavy burden on teachers，and lack of more open and flexible arrangement of courses，further improvement is necessary，for instance，coordinated and abundant supply of on-campus and off-campus resources，optimized arrangement of educational activities in and after class，adoption of multiple measures to reduce the burden on teachers，and strengthened dynamic monitoring and performance evaluation for sustainable development.