我国城市正在经历地铁建设大发展的时期，一个十分紧迫且十分重要的问题是在进行线路建设前如何做好地铁线网布局规划。文章结合近年来国内开展地铁线网规划的实践，探讨了地铁线网规划中的几个关键问题，包括线网合理规模的论证、线网空间形态与构架以及地铁线网与城市其它交通方式的衔接等问题。

Many cities in China are now experiencing the booming period of metro construction. A critical and urgent problem is how to work out a sound network planning for the metro system before the concrete line implementation. Based on the experiences of metro network planning in China these years, the paper intends to explore some critical issues in this field. That includes the reasoning of the rational scale of the metro system, the spacial form and framework planning and the integration of the metro system with other public transport systems in the city.