The Hainan Airlines flight experienced strong turbulence at an altitude of 4,200 metres after it had already started descending, but managed to land safely at Beijing Capital International Airport the airline said in a statement.
Of the 30 people who were injured, 23 are hospitalised for further examination and observation while seven others were treated for minor injuries.
Hainan Airlines said the cause of the bumpy ride was "pending investigation" and Lin, an injured passenger on the flight said many on board were not wearing their seatbelts, and they bounced immediately.
Another passenger shared the experience on her Weibo account named "PhotoByJade" said it was the worst turbulence she had encountered in years of flying.
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"I was really scared seeing the injuries in the back rows and hearing the passenger announcement mixed with the air stewards' tearful voices," she wrote.
While the investigation is still ongoing, it is too early to rule whether the pilots made any errors.