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The network design for rapid transit system has been based on single mode consideration traditionally. However, rapid transit technology development in recent two decades can be categorized into two classes, high-capacity systems and medium-capacity systems. So there is a need to develop a model or an approach to conduct the network design for rapid transit system with composite technology. In approach of network design for rapid transit system with composite technology,there are two main points: one is the definition of composite technology, the other is the criterion of optimization for network design. For the former , this study adopts different technology for different line in accordance with its patronage; For the latter, this study searches a network with maximum patronage and develop a heuristic algorithm to get it. The network of rapid transit system can be divided into two parks: the trunk line network and the branch lines. In modeling the optimization for trunk line network,the factors of passenger route choice behavior,the coverage of stations, and the characteristics of rapid transit technology are considered. Finally,a fabricated example is presented for demonstration.
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