Research on two-phase chain store distribution vehicle routing problem with soft time windows

According to chain enterprises distribution routing optmization decision making problem,this paper established a mathematic model of the problem by using the decomposition method for two phase analysis,and introduced a time window constraints.First,the method determined the optimal number and locations of suppliers and distribution centers by using minimum wrap-net method,then used TS to search the optimal routes from distribution centers to stores.The test example shows the validity this method of and practical value.