The evaluation index system for the regional rail transit network is different from those of the highway network and public transportation network.

From the angle of the regional economy development and the optimum distribution of resources in the world,this article stresses the importance of the construction of regional rail transit (RRT) network,which is based on the concept of one-day-trip circle and makes the basic principles for RRT and the evaluation index system.

Backgrounded with the urgent construction of regional rail transit (RRT) in the Yangze River Delta, this paper discusses the advantage and disadvantage of rail transit financing in this region,argues that a multi-channel and multi-factor mode shall become the main trend.

It\'s necessary to develop regional rail transit network in Yangtze River Delta in order to support sustainable development of this area.

This paper introd uces the principle of transport organization, analyzes the character of differ ent routing modes from service level,traffic capacity and rolling stock, and pro poses some feasible routing modes on regional express rails.

With an introduction of the characteristics of the lines and construction of RER in Paris,this paper mainly analyses the distribution patterns of RER stations,argues that the planning of regional express rail in China shall refer to the successful patterns of Paris.