Beijing police have stepped up CCTV monitoring in 19 counties and 362 police stations, boosting coverage in the capital to 100 percent.
Project Sky Eye, launched in 2012, is aimed as a deterrent against crime and illegal assemblies, Beijing Morning Post reports.
Popular areas such as shopping arcades, markets, bus stops and parks are now equipped with surveillance cameras.
Beijing had 300,000 cameras at the time of the 2008 Beijing Olympics, excluding mobile cameras on taxis, according to Ming Pao Daily.
The expanded CCTV coverage is a 29 percent increase over that number.
Project Sky Eye, which involves more than 4,300 police officers, has helped crack 1,500 cases this year, resulting in the arrest of 2,370 suspects, up 5 percent from a year earlier.
Meanwhile, criminal cases have fallen to 2,480, down 27.7 percent from the previous year.
The official Xinhua news agency is reporting that the Changsha city government has invested 528 million yuan (US$83.1 million) in a three-year program to set up 27,000 high-definition street cameras and 4,000 mobile monitoring devices on buses.
In 2014, 6,400 high-definition cameras were installed in Changsha’s rural areas, bringing the total to 50,000.
Changsha police said the cameras have helped them solve more than 17,000 cases.
New York-based lawyer Xiang Xiaoji said the cameras are not only being used to fight crime but also to crack down on public gatherings.
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