Footage from a Starbucks outlet in Wuxi, Jiangsu province appeared to show staff using expired chocolate liquid to make drinks.
There was also an employee changing the expiration date on a package to a week later than the original date.
At another Wuxi store, employees sold baked goods dated the day before.
Both stores involved were temporarily closed.
Wuxi's Market Supervision Administration yesterday confirmed with Starbucks that expired ingredients were used and that expiration dates on labels were extended.
The administration said it has begun investigating the chain's 82 cafes in the city,
and already found a variety of hygiene issues.
Starbucks China apologized last night on his WeChat account.
It said all cafes on the mainland were ordered to meet food safety standards.
Starbucks China also announced that it will be retraining all employees about the importance of food safety.