Troops disposition of army anti-aircraft missile unit is the foundation in anti-aircraft campaign, including position selecting and distributing. Aiming at the problem that impersonal condition and subjective decision-making is well both concerned, analyzing interrelated factors which influence position selecting and distributing. Then confirm index system of position selecting and distributing, and design a method to choose position which combine grey comprehensive relationship and improved analytical hierarchy process. Besides, Aiming at the problem that assigning position model lacking dynamic and mobile, fuzzy mathematics is used in modeling position selecting, and solve the model with genetic algorithm of bee dual population evolution .The method can combine objective analysis with quantitative analysis effectively and with its simple model, which provides a good way for troops disposition.