Where can I buy a marathon through quota?

Marathon crossing places can't be bought. The number of marathon passes is set by sponsors, organizing committees and other institutions, and there will be announcements and related instructions when registering. In different competitions, the conditions, quantity and distribution of passing places will be different. Athletes who get through places need to have certain achievements or specific identities and qualifications. Therefore, the marathon through train quota cannot be purchased directly, and can only be obtained after meeting the relevant conditions.