文章叙述了在地下无线电通信中的两大技术难题——弱信号接收和抗雷电脉冲干扰，提出其解决途径，并介绍解决这些技术难题的关键设备——弱信号抗雷电电报终端机的设计方案，分析该机的性能和给出实验室测试和现场试验的结果。

Two difficult tedhnical problems in underground radio communications, i.e. weak signal reception and counter lightning pulses interference are described, and ways to solve these problems are proposed . The design scheme of the telegraph terminal used for weak signal reception and counter lightning pulses interference is exhaustively studied. The performances of this terminal are analyzed, and results of laboratory measure and field tests are also given.