Knee osteoarthritis (KOA) is known as degenerative joint disease, which is the most common form of arthritis and the leading cause of disability, loss of function and pain worldwide. Effective therapy to manage RA is still lack at present. Fangji Huangqi pill (FHP) is a Chinese medicine which has been widely used in treating KOA in China for hundreds of years to relieve pain, reduce swelling and protect the affected joints from further degeneration. However, no certain evidence to show the effect of FHP for the management of active KOA.