Abstract: The goal of this research is the determination of practice on interpretation of law on the use of force by International Court of Justice. The article explores four cases: Corfu Channel, military activities in Nicaragua and against Nicaragua, oil platforms (the Islamic Republic of Iran against the United States), and armed activities on the territory of Congo (the Democratic Republic of Congo against Uganda). The author analyzes the question of legitimacy of the use of force: conclusion on nuclear weapon, and conclusion on the question of construction of the Wall. The article applies the method of synthesis for determination of general approach of the court; as well as comparative method to reflect the development of case law in the sphere of the use of force. The author advances an ides on establishment of legal institution on the use of force. The substantiation for this is traced in the decisions of International Court of Justice. Presence of the full-fledged and universal institution on the use of force would contribute to decrease of controversial grounds for the creation of new doctrines.