Within the lockdown area, residents are asked to stay at home, including buses, subways, and taxis will be suspended, and businesses should either be subject to closed production or work remotely.
The staggered lockdown approach means half of the city will keep running at all times.
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Li Jiamin, 31, who works in the finance industry, said she had packed several days of clothing and supplies, and her company was sorting out sleeping and eating arrangements.
There were 12,474 asymptomatic infections, of which 70 were imported and 12,404 were domestically transmitted 11,956 in Shanghai, 102 in Liaoning, 80 in Jilin, 76 in Jiangsu, 66 in Shandong, 41 in Jiangxi, 31 in Zhejiang, 14 in Henan, 13 in Hebei, 8 in Anhui, 7 in Heilongjiang, 3 in Beijing, 3 in Yunnan, 2 in Hubei, and 2 in Guangxi.
No new deaths were reported.