The purpose of this article is to find out the different of index of metabolism of breath and energy between the senior citizen who has often trained 24 style Tai Chi for a long time and the new learner when they just finished 24 style Tai Chi, and the results tell us that the index of testing of the senior citizen who has often trained 24 style Tai Chi is much better than the new learner, so the results indicate Tai Chi can improve the function of metabolism of breath and energy of the senior citizen which as a science proof of the senior citizen who trains the Tai Chi.