The city which is the capital of the Jilin province and an important industrial base has a population of 9 million residents.
According to the Covid-19 guidelines, residents are required to remain at home and undergo three rounds of mass testing.
On the other hand, non-essential businesses have also been closed and transport links suspended.
Notably, China reported more than 1,000 fresh Covid-19 cases in various cities of the country.
This was the highest single-day spike in the number of positive cases in about 2 years.
Of these, 98 cases were found in Jilin province that surrounds Changchun.
However, just two cases were detected within the city.
Authorities have already ordered a partial lockdown in the city and severed travel links with other cities.
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