This study aims to describe of the violation of the principle of cooperation in Surabaya students' conversations. The research data are in the form of student utterances in their conversations. The method used is the listening and tapping techniques, advanced SLC (Listen to Engaged), and note-taking techniques. The results show that each maxim in this current study can be divided into two: single maxims and multiple maxims. The single maxims include the maxim of quantity, the maxim of quality, the maxim of relevance, and the maxim of manner. Meanwhile, the multiple maxims include the maxim of quantity, the maxim of manner, the maxim of relevance, and the maxim of manner. The kinds of violations that mostly occurred in the data are the maxim of quantity and the maxim of manner both in the form of single and multiple maxims. The use of the cooperative principle in a conversation can be in the form of mocking, sarcasm, lying, or expressing a hope to confirm information. Meanwhile, the effect caused in the speech is blurring of information and clarifying existing information (maxim of quantity); covering up information (maxim of quality); being funny, annoyed (the maxim of relevance); and covering up shyness, excessive speech, unclear, and the impression of joking (the maxim of manner)

Keywords : Language, Cooperative Principles, Student Conversation.