Real-name reservation, with a 65,000 daily cap
Since 1 June 2019 Badaling has run full-network real-name reservation ticketing with single-day visitor-total control, and its daily best-carrying capacity is 65,000. That cap is the reason a walk-up is refused once the day fills — it is Badaling's own number, not a generic rule.
Official source: Beijing Municipal tourism portal (visitbeijing.com.cn), republishing Beijing Daily — 八达岭长城启动全网实名预约售票 可提前7天网上预约购票 每日最大流量6.5万人次 (source dated 2019-06-04; read August 26, 2026)