Abstract: In recent years the fast development of theoretical and experimental research on Bose-Einstein Condensation (BEC) and its quantum optics properties has made a series of breakthroughs, and a new branch of atom optics，"quantum atom optics"，has been created. What is meant by quantum atom optics, and recent experimental progress are introduced in some detail, covering the major advances in BEC experiments, the preparation of atom quantum states，the generation of atom lasers, quantum coherence in BEC and atom lasers，the quantum degeneracy of Fermi atoms, and so on.