Decision making for multi-target attacking is composed of target grouping and attack direction optimizing. Analysis is made to the Launch Acceptable Region (LAR) of Small-Diameter Bomb (SDB) in multi-target attacking. Then, the mathematical models of target grouping and attack direction optimizing are established. The decision-making is divided into three steps of multi-target grouping, attack direction optimizing and LAR calculating. The feasibility of the proposed model is verified through scenario simulation.