Since 1840, after 100 years, the Forbidden City has never been large-scale maintenance.
After the founding of New China in 1949, Forbidden City Palace Museum through the construction of the census, the problems for the Forbidden City, the implementation of the Palace restoration of ancient buildings first five-year history of governance and emergency planning, and fundamentally changed the old society, leaving Palace Broken face of the desolate, so show magnificent scale.
In 1973, the instructions of the Central National Palace Museum, the second five-year plan to develop a "National Palace Museum, five-year repair protection plan." In addition to strengthening the planning restoration of ancient buildings, the main involve the installation of heat pipes, cable engineering, sewage pipeline engineering, lightning protection devices, and many, many professional protection.
The Imperial Palace since 2002 overhaul plan, has to continue until 2020. This opened up some of the repair phase after the addition of attractions, but also the museum staff of more than 1000 long-term occupation of office space to re-repair, then, the "open area" will increase from the current 30% to 70% .