Tourists take selfie as they visit the Tian'anmen Square in Beijing, capital of China, Oct 1, 2015, the first day of the National Day holidays. [Photo/Xinhua]

"I cannot wait for my trip to Shanghai, I would like to see the Bund and go to Xujiahui District," said Chen Jie, a doctor from Sichuan Province, southwest China. "But I am concerned about the crowds."

The holiday will put pressure on railways.

More than 100 million passengers are expected to travel by rail during the holiday, China Railway Corp. said on Wednesday. A record 13.3 million passengers will take trains on Oct. 1, up 13.4 percent from the same day last year.

In Nanchang, one of the country's busiest transportation hubs, the local railway bureau has added 39 trains, including 31 bullet trains, to ease pressure. The city in east China's Jiangxi Province expects to transport 930,000 passengers by train on Thursday.

Meanwhile, Guangzhou Railway Group Corp., which operates trains in migrant workers-concentrated Guangzhou and Shenzhen, has scheduled 39 extra trains to meet demand.

Many airlines contacted by Xinhua said they had also increased the frequency of flights.