China's state aviation supply firm has reached an agreement covering purchase of 140 Airbus jets including 40 A350s.
Airbus has confirmed the general terms agreement for the aircraft, the balance of which comprises 100 A320-family jets.
The pact was signed in Berlin with the China Aviation Supplies Holding Company, in the presence of German chancellor Angela Merkel.
No engine selection has been given for the single-aisle jets. The A350s will all be fitted with Rolls-Royce Trent XWBs as standard.
Airbus has not given any indication of delivery dates or the specific variants of either the A350s or the A320-family aircraft. The eventual airline operators have not been disclosed.