"The number of foreigners eligible for the free-visa policy has increased gradually," Zhu said.

"The policy has been praised by international travelers. But based on a survey, about 40 percent of international travelers said 72 hours is insufficient for them to enjoy the city of Beijing, and they wished to extend their stay," Zhu said.

In 2016, the 72-hour stay in Beijing was used on 26,323 passenger trips, an increase of 32 percent from 2015.

Ports of entry are also extended to designated international railway ports, seaports and airports, said Ji Lixia, deputy general head of the Beijing General Station of Exit and Entry Frontier Inspection.

Travelers can arrive using six entry points, two in each jurisdiction: Beijing Capital International Airport and Beijing West Railway Station in the capital, Tianjin Binhai International Airport and Tianjin International Cruise Home Port in Tianjin, and Shijiazhuang Zhengding International Airport and Qinhuangdao seaport in Hebei province. Previously, the policy applied only at airports.

"The diversification of ports for entry is convenient for international travelers to choose suitable transportation based on their travel plans," Ji said.

The Beijing airport has started a new policy to help travelers. "The airport can keep luggage for those travelers for 144 hours for free," said Meng Xianwei, general manager of the aviation business department of the airport.

In 2016, Shanghai and Jiangsu and Zhejiang provinces took the lead in permitting 144-hour visa-free entry for visitors from 51 countries and regions.