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One of the important themes in the study of Gojoseon's territory and foreign relations is related to Cang-hai Commandery. Cang-hai Commandery was installed in the area of Gojoseon in Former-Han 20 years before Gojoseon was destroyed. But it is a Commandery that was abolished in three years. In the meantime, there have not been many studies on Cang-hai Commandery, and Several opinions were derived. In this article, we looked at when and why Cang-hai Commandery was installed, why it was installed, where it was installed, and for what purpose it was installed. Cang-hai Commandery is installed in 128 years of B · C as in the previous data. During the installation process, Pangou traded with Namyeo, a chief of Ye. In the Former-Han, Namyeo judged to belong to the Former-Han and installed Cang-hai Commandery in the area where Namyeo resides. At that time, Former-Han installed the Cang-hai Commandery, created a Commandery in the Southwestern Barbarians Area in the south, and installed a new Commandery in the north such as The Shuofang Jun. At this time, a lot of money was spent on operation. In addition, when the Cang-hai Commandery was installed, Gojoseon and Namyeo Group were also abolished in 18 months. Cang-hai Commandery is located on the central and southern coasts of Liaodong Peninsula. The purpose of installing the Cang-hai Commandery in Former-Han is to secure coastal salt and inland iron. There was also a purpose to obtain the geographical advantage of checking Huns by securing the change of Gojoseon which is adjacent to Huns.