Visitors transiting China to a third country now can stay and visit Beijing for up to 144 hours visa-free (instead of 72 hours, previously allowed prior to last Dec. 28, 2017, as part of an expanding tourism-friendly program.).
Citizens of the U.S., Canada, and 51 other countries are now permitted to travel visa-free in Beijing, Tianjin and Hebei province within 144 hours. Keep in mind, the travelers must hold the required documentation and have purchased tickets with a fixed date to depart to a third country or region.
In addition, the new policy not only doubles the time a traveler can stay visa-free but also allows entry through train terminals and seaports. The previous rules allowed visitors to enter only through airports.