This paper researches the deployment decision problem on terminal low altitude TBMD systems. Firstly, in view of the characters of terminal low altitude TBMD systems, the decision rules are discussed. Secondly, multiple attribute decision model of the weapon systems deployment is built, the basic deployment conditions and decision process are proposed, which include two important factors: decision parameter calculation and multiple attribute decision. Thirdly, according to the characters of the parameters and the deployment decision model, the System Dynamics (SD) calculating simulations model on decision parameters is built, which is useful for the calculation of two important decision parameters. Finally, the calculations of alternative deployment positions' decision parameters are performed by the SD model, and the deployment schemes order is acquired by the decision model. The case application shows that the decision model is effective.