Three main tasks for tactical fleet planning are proposed,and the logistics process of cars is described from three aspects,namely operation features,car rental process of customers,and fleet management.Based on the nested demand characters of leasing sites,this study builds models to optimize resource allocation for multi-site and multi-type in a pool and puts forward solution methods for the circumstance of fixed demand and stochastic demand,respectively.Case study and experimental results in the application prove that the proposed model and algorithm can achieve the tasks of tactical fleet planning.