Lee Minhyung This study recognizes the lack of domestic studies that focus on the role of the opposition team and understand its strategies from a broader perspective. It aims to provide a macroscopic perspective of the negative team that is essential to prepare and manage a debate on policy proposition. In particular, the study examined the different aspects of the first negative constructive in high school debates, and obtained results by learning the relevant strategies. The analysis shows that the oppositions use various strategies. However, they lacked effective reasoning and justification, and was not strategically presented because they can’t focuse the affirmative case and form the L-R-I structure. k e y w o r d s Korean Education, Debate Education, Negative, Constructive Speech, Burden of Proof, Presumption, Procedural Arguments, Substantive Arguments, L-R-I structure