Tai Ji is a kind of Chinese traditional and healthy sports, which was inherited from several thousand years ago in Chinese history. It is popular and widely developed in our country. This article mainly discusses its technical features and its improvement effects on the mid-aged and old-aged body functions such as cardiovascular system, immunity system, and digestion system and as respiration system. It also dwells on its adjustment effect on the psychological health of the mid-aged and the old-aged people. Key word Tai Ji Sports; the...