In this paper, Multi-layered Structure of facilities system and Multi-layered Facilities Location Problems that minimize the sum of travel costs are proposed. To analyze optimal location, 2 facilities complexes location problem on a segment is concerned. Optimal solution is derived analytically, and system configuration to obtain the solution on a segment and char- acteristics of optimal locations are investigated. Also, a heuristic method of solution is presented, which is applicable to location problem in N-dimensional Euclidean space. Through computational simulations, the effectiveness of presented algorithm is confirmed. Finally, various facilities complexes including obnoxious facilities locations with multi-layered structure are demonstrated, and their optimal locations are investigated.
