To chant objects is a tradition of Chinese poets in early Shi-Jing. During this period, nature was just described as observed objects without literal metaphorical functions. Gradually, the describing skills of the poets became more progressive and their emotions were getting deeper and stronger. Then the metaphorical function was slowly expanded with observed objects given various kinds of emotional significance. The literary works were obviously consumed with the poets' laden emotions, and hence filled with an enormous amount of aesthetic values. In the Song Dynasty, Ci, a special poetic form in common with Shi, experienced a similar evolution of object chanting. But the metaphorical significance of Ci poems became increasingly intense and varied. Usually, flowers were the primary items for poets to chant, e.g. orchids, lotuses, chrysanthemums, and plums, because of their eye-catching characteristics. Since the poplar blossom is very small and lacking in fragrance or beauty, poets often neglected her; but brilliant and emotional poets still gave the poplar blossom extraordinary vitality with their pens. This paper intends to research the metaphorical significance of the poplar blossom. How was it being described? How was it being expanded? Furthermore, this paper discusses the poets' living backgrounds in order to explain the formational causes of the metaphorical significance inherent in Song Ci poems.