In this paper, six characteristics of hollowedout bronzes were analyzed. The technological development can be divided into four development phases. The initial phase is represented by a box with a hollowedout dragon design from Rui tomb and the Ding (鼎) with a hollowedout snake embossment from Xinjiang; the forming phase is represented by Yun’er Zhan (盏) and Xugong Ning handles with hollowedout dragons; the ripe phase is represented by bronze Jin(禁) from Xiasi in Xichuan and Zenghou Yi Zun(尊) and Pan(盘); the highlevel phase is represented by the Chen Zhang Hu (壶). According to the excavated plots and the dates of these bronzes having hollowedout dragon or snake designs, it is suggested that this technique spread from the Han State to the Chu State and then to the other areas, which include today’s Shanxi, Henan, Hubei, Jiangsu and Hebei provinces.