This paper describes the interface of signal system（SIG） with PSD / APG and its requirements,which were applied in Shenzhen Metro Line 3.Furthermore,the principles of CBTC＇s supervision over PSD/APG were analyzed including the principle of fail-safe.%阐述了深圳地铁3号线信号系统（SIG）与屏蔽门/安全门（PSD/APG）之间的接口功能及其要求,并在此基础上分析了CBTC系统对屏蔽门/安全门的监控原理,以及故障-安全原则的应用。
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