Air China said that the plane made the unscheduled stop due to "public safety reasons" and that police and civil aviation were handling the situation.
As per a brief statement on the airline's website, the Civil Aviation Administration of China states that a male passenger on the Air China Flight 1350, attempted to use a fountain pen to hold the flight attendant under threat.
Another passenger said flight attendants told passengers they had to land at a different airport but she had not heard of anything amiss.
Air China flight CA1350 reportedly took off from Changsha, Central China's Hunan Province. The Airbus A321 aircraft landed safely approximately 1hr 15mins after takeoff - Chinese authorities have said that no passengers or crew were injured.
The Zhengzhou airport said it activated emergency measures as soon as the flight informed it about the incident, and that the airport was now operating normally, AP reported.
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Nobody was hurt in the incident and another plane was sent so the passengers could resume their journey.
An Air China flight headed for Beijing made an unplanned landing in the central Chinese city of Zhengzhou on Sunday.
The Xiaoxiang Morning Herald quoted a passenger as saying that the problem was in first or business class.
Police in Zhengzhou's Henan province said in a statement that the alleged hostage-taker had a history of mental illness and suffered an unspecified "sudden" psychological disorder when he grabbed the flight attendant.