Abstract: Combining the design example of approach section coding in the Haolebaoji-Ji'an Railway project, this paper analyzes the reason of receiving U2 code incorrectly from the approach section in rear of the home signal, proposes a suggestion and provides design ideas for subsequent projects.

Key words: approach section, coding, optimization design

摘要： 结合蒙华铁路工程接近轨电码化设计实例，分析进站信号机外方接近轨错误收到U2码的原因，并提出解决方案，为后续工程提供设计思路。

关键词: 接近轨, 电码化, 优化设计