“Cheng Yu(乘輿)” is not attached to distinct attributions in identity during the pre-Qin period, while according to the renaming document in Liye Qin bamboo slips, the first emperor of Qin changes it to a special appellation of the emperor after he have unified China. In later stage of the period of Warring States, there are several ideas about great unification and national thoughts of “Tian Xia(天下)” like “the sky is a cover and the ground is a vehicle(天爲蓋, 地爲輿)” or “Tian Zi(天子) takes Tian Xia as his home and he is not supposed to always stay in palaces at the capital but travel round Tian Xia on his vehicle(天子以天下爲家, 不以京師宮室爲常處, 則當乘車輿以行天下)” prevailing, which directly influence the first emperor of Qin. Regarding Tian Xia as his own country, he compares it to a “Yu(輿)” and considers himself as a wise emperor who travels round on it. “Yu Di Tu(輿地圖)” is also new appellations created under the influence of this concept. Since then, appellations like “Yu Di Tu” and “Yu Tian” are inherited by the later dynasties, and they have accompanied the emperor system from beginning to end.