Main Library South Area, National Library of China, Research library building in Zizhuyuan Subdistrict, China.

The Main Library South Area, formerly the Beijing Library New Building, stands at 33 Zhongguancun South Street in Haidian District. Its twin-tower main stack rises 19 floors above ground and 3 below, clad in blue and drawing on Han dynasty gate-tower forms. Two five-storey wings flank it around large planted courtyards, holding over 30 reading rooms and open stacks.

The building was designed after Premier Zhou Enlai rejected an expansion at the old Wenjin Street site in 1973 and approved a new site outside the city. Construction began on 23 September 1983 at Baishiqiao Road, and the new Beijing Library opened on 6 October 1987, with Deng Xiaoping writing its name. It was named the top of Beijing's Ten Great Buildings of the 1980s. In 1998 it became the National Library of China, and after the North Area opened it was called the South Area. It closed for renovation from 10 May 2011 and reopened on 9 September 2014.

The building's name was written by Deng Xiaoping when it opened as the Beijing Library in 1987. Since 10 September 2014 it has also housed the National Museum of Chinese Writing, the country's first museum devoted to classical texts, with 11,549 square metres of exhibition space, free to enter.

Visitors should reserve access in advance, as the building is open Tuesday through Sunday starting at 9:00 AM. It's wise to check opening hours beforehand since they may vary seasonally.

The building houses a portion of one of the world's largest collections, featuring ancient manuscripts, digital resources, and contemporary publications. The holdings grow continuously, reflecting both historical and modern research interests.