Shanghai, which hosted the World Expo, has a mature security system.
The Shanghai Cooperation Organization (SCO), which aims at counter-terrorism and security, was also born in Shanghai, and many countries of the AsiaInfo Summit are members of the SCO.
Shanghai's status as an international metropolis.
The ships participating in the Sino-Russian military exercise docked at Wusong Military Port in Shanghai to facilitate Putin's participation in the ceremony.
The central government's high trust in Shanghai.