With the discussion on the origins and the evolution of Star Twelve Points, combined with ancient astronomical stellar map, it is realized that the three-dimensional spatial diagram of Star Twelve Points can be approximately regarded as a Big Dipper map from the side view. Under the direction of image thinking, the function of Big Dipper was compared with the function of Star Twelve Points. Furthermore, according to "the opening-closing-pivoting" theory in and the theory of " cycle in round" proposed by , the mechanisms of Star Twelve Points on adjusting functional activities of and the movement of viscera-meridian--blood is elaborated, providing a new idea for acupuncture clinical treatment of miscellaneous diseases.