This paper sheds light on management of the Regulations under which Japanese trade is to be conducted in Korea signed on July 25, 1883. While enforcing taxation, there were conflicting opinions around the article 16 and 18. The article 18 prohibited dual taxation, yet the problem was frequently mentioned in official documents between Korea and Japan. Japanese government carried out investigations on tax Bokse(卜稅) and Suwolse(手越稅) and examined consuls and merchants’ public opinion in Joseon. They insisted on maintaining the status quo rather than abolishing dual taxation. However, Japanese government did not accept the local opinion and demanded Joseon government to remove dual taxation through negotiation. On the other hand, Joseon government saw the practical necessities to maintain dual taxation to secure finance. Because of that reason, Joseon Government could not cope with the situation actively. Joseon aimed to prevent misapplication of article 16, which included diplomats’ exemption of tax and check in the maritime customs. Joseon government referred to the specific provision of the Elements of International Law to prevent outflow of red ginseng by using diplomatic bag. Joseon could partially accomplish her demand to strengthen supervisor on the maritime customs. It is remarkable that Joseon availed the Elements of International Law to attain her intention during the negotiation between Korea and Japan.