This study focuses on ant colony optimization (ACO) in decision making of skills and tactics in badminton. The model about decision making of skills and tactics in badminton based on ACO is put forward and explained, with the ultimate objective to win in competitive sports relying on skills and tactics. According to the technical and tactical characteristics of badminton competition concluded based on item group theory, the simulation model of ant colony system is formulated, providing theoretical support for the algorithm design, and vividly explaining the principle and mechanism of ant colony's route search.