分析现阶段北京轨道交通发展现状，提出研究市域轨道交通主要技术指标的必要性。北京市域快线具有服务半径大、旅行时间长、运行速度快、服务水平高等特点，把市域快线特点需求归纳为需求层、服务层、系统层3个层次，提出北京市域快线最高速度、旅行速度、行车间隔、车辆定员、车辆参数等指标。

This paper analyzes the development of Beijing rail transit at the present stage, proposes the necessity to study the main technical indicators of regional rail transit. In order to clearly position the regional express and reflect the urbanity features, the technical indicators of regional express are divided into three levels of analysis, which are demand layer, service layer and system layer. Based on the features of Beijing regional express, the paper analyzes and defines the demand indicators, service indicators, line selection indicators and system indicators of Beijing regional express.