The present invention relates to an oral formulation comprising a hyaluronic acid-phospholipid complex, and to use of a hyaluronic acid-phospholipid complex for the manufacture of a joint function-improving and protecting agent for oral administration which can alleviate the arthritic symptoms in patients with arthritic conditions, increase the concentration of hyaluronic acid in synovial fluid, improve the lubrication of joints, as well as maintain and enhance the normal functions of joints.