Abstract: In order to solve the emergency material dispatching problem for major disasters, based on three-level network of the supply points, supply hubs and demand points, the fuzzy demand and supply conditions and intermodal transportation are studied in this paper. Firstly,a multi-objective nonlinear programming model is proposed with the objectives of total transportation time and cost on the condition of maximizing demand fulfillment rate. It considers two situations of oversupply and short supply. The materials of short supply are supplied with priority Furthermore, the most likely value method is used to determine the weight of fuzzy number and level of confidence. Triangular fuzzy number is converted to determine value with the average weight method. It provides defuzzification strategies and specific algorithm. Decision-makers dynamically give weights to both the objectives thus the flexibility of the model is improved. It finally designs a simulation example according the background of Wenchuan earthquake and verifies the validity of the model with the example.

Key words: fuzzy supply and demand, three-level network, intermodal transportation, dynamic dispatching