The purpose of this paper is to reestablish the history of Han immigrants who entered and cultivated the land in the regions of aborigines. The main focus will be on the emerging of Han street names in the aboriginal area. This paper provides several discoveries through the fully utilization of new excavated historical documents. The paper starts with the Hom-Ya Tribe of Pei-Tou Group, the earliest inhabitants in Tsau-Tweng area. The Pei-Tou Group was always the largest aboriginal group in the central Taiwan during early Ch'ing dynasty. However, the group lost most of their lands to the Han immigrants at the beginning of Emperor Dauguang era and was forced to move into Puli. Han immigrants entered Tsau-Tweng area during Emperor Yongzheng era. Initially they traded with the tribe and then they claimed the lands and cultivated them. The early Han immigrants occupied the fertile lands that were closer to the water source such as Yu-May-Tsu, Chi-Chou, Da-Tiau-San-Jiau, Tsau-Shia-Dun. The Han immigrants who arrived later could only plowed the poor soil area such as Pei-Tou-Pu, Chi-Tsung, Tsing-Jweng. After the available land was used up in Tsau-Tweng area, they moved further east into Mu-Zar Bau-Ze-Liau tableland. Some of them moved across I-Liau and entered Nan-Pu, Tu-Tsung, Pei-She-Nan area until the end of Wu River.and the beginning of Emperor Chiach'ing era. Therefore villages and communities were formed during that period of time. The first Han street name in Tsau-Tweng, Pei-Tou Old Street, existed no later than the era of Emperor Ch'ienlung. Later, there were Pei-Tou New Street appeared during the era of Emperor Chiach'ing and Tsau-Shia-Dun Street during the era of Emperor Guangxu. During the Japanese Occupation, the major roadways from Tzung-Hwa to Puli and from Taichung to Nan-Tou were met at Tsau-Shia-Dun. That was the beginning of Tsau-Shia-Dun and the end of Pei-Tou. In 1920 Japanese renamed Tsau-Shia-Dun as Tsau-Tweng and it thus fully replaced the leading role of Pei-Tou even until now.