Over 20 people. According to the pipe network of the National Social Science Fund Planning Office, when the National Social Science Fund Committee formulates the national social science plan, it usually sets up an expert committee to be responsible for the drafting, review and approval of the plan. This expert committee is composed of a group of experienced scholars and experts with high academic level, and the number is generally more than 20. To formulate a national social science plan, we need to consider the comprehensiveness and professionalism of various fields. Therefore, in addition to the expert committee, it is also necessary to attract well-known scholars, experts and relevant institutions in various fields to participate in extensive discussion and research on planning, so as to formulate more instructive and feasible planning schemes and implementation measures.