International Treaty Law today has experienced great development along with the development of International Law. International relations due to globalization have been marked by fundamental changes, including the emergence of new non-state subjects accompanied by increased intensive interactions between these new subjects. This fundamental change coincides with the character of international relations which increasingly knows no national borders, so that international treaty law plays an important role in becoming the main instrument for implementing international relations between countries.

International treaties have an important role in regulating the life and relations between states in the international community. In a world marked by interdependence in this global era, there is not a single country that does not have agreements with other countries and is not regulated in international agreements. This is driven by the development of international relations, both bilateral and multilateral. This development is partly due to the increasing communication and information technology which has an impact on accelerating the flow of globalization in the world community.

Making international treaties that regulate various aspects of human life, both specifically and universally, is an effective and efficient means of overcoming problems that arise as well as ensuring prosperity and peace for humans. Until 1969, the making of international treaties was only regulated in customary law. Furthermore, it is regulated in the Vienna Convention on the Law of Treaties which was signed on 23 May 1969 and entered into force on 27 January 1980. This convention has become positive international law.

The development of international treaties law was initially only regulated by customary international law. In practice, customary international law has several weaknesses, among others, its substance is not clear or vague, so that it does not guarantee legal certainty. Based on this, the legal rules of international treaties made in written form must be realized immediately.

In the mid-1960s, the International Law Commission (a commission established through UN General Assembly Resolution No. 174/II on the establishment of an International Law Commission) paid attention to the problem of codifying the law of international treaties. The International Law Commission prepares a draft Convention on the Law of Treaties which specifically regulates treaty matters between countries. The draft was submitted to the United Nations General Assembly. After the UN General Assembly issued two resolutions (Resolution No. 2166 (XXI) and No. 2287 (XXII)), which essentially called on its members to immediately hold an international conference in the field of treaty law, an international conference was held in Vienna, Austria, on 26 March-24 March 1968 and continued on 9 April-22 May 1969.

The result of the conference was the agreement on the text of the convention and on 23 May 1969 it was signed by the representatives of the countries holding the negotiations. This convention became known as the 1969 Vienna Convention on the Law of Treaties. This Convention entered into force on 27 January 1980.

In its development, the International Law Commission has re-prepared articles for international treaties between countries and international organizations, and between international organizations and international organizations. With the same mechanism as the procedure for making the 1969 Vienna Convention, on 18 February-21 March 1986 the Vienna Conference, Austria, was held to discuss the draft of the International Law Commission.