讨论地铁设计过程中信号专业与行车、土建、车辆等专业配合所遇到的各种速度。从信号系统特点出发，结合工程实例，分析相关专业对信号系统列车最高运行速度的影响，从而使相关专业理解信号专业的速度概念，避免出现非期望的压低列车运行速度的情况。

A variety of definitions on speed of signal system is encountered in cooperating with traffic fields，civil engineering fields， vehicle fields and so on during design of metro． Considering the characteristics of signal system together with engineering examples， the paper analyzs the impact of relevant fields on maximum operating train speeds for signal system to help the relevant fields to understand the concept of speed of signal system and to avoid non-desired low train speeds．