in order to achieve highly reliable application program layer, applicability and availability of ada program language is analyzed . at last, a new software voting mechanism is introduced 为了实现应用程序级的高可靠性,本文论述了使用ada程序设计语言进行fadec系统程序级容错设计对fadec系统的可靠性提高具有明显贡献,而且易于实现。