Abstract: A pharmaceutical composition containing hyaluronic acid and mesenchymal stem cells and its use in treating cartilage damage-associated diseases are disclosed. Compared to when hyaluronic acid and mesenchymal stem cells are administered as a mixture, administering mesenchymal stem cells after first administering hyaluronic acid may exhibit superior effects in alleviating disease symptoms in joint tissues affected by arthritis and also decrease the load on knees due to body weight. Accordingly, the pharmaceutical composition may be beneficially used in the treatment of cartilage damage-associated diseases.