Why is the painting of Mount Tai hanging in the welcome hall of Qingdao International Conference Center?

It means "national peace and security".

Qingdao International Conference Center is the main venue of the Qingdao Summit of the Shanghai Cooperation Organization. There is a huge Chinese painting with Taishan theme hanging in the welcome hall, which is 2 1 m long and 7.5 m high, meaning "peaceful and prosperous times". The towering walls on both sides of Mount Tai map depict the scenes of the Maritime Silk Road and the onshore Silk Road respectively. Mount Tai is not only a symbol of China's traditional culture, but also implies the theme and goal of the conference, that is, to expect all countries to coexist peacefully and achieve common prosperity and development.