In order to improve dependability of safety critical systems, whose safeguard technologies are researched inthis paper. Firstly, origins and meanings of dependability are expatiated, afterwards, respective meaning of and rela-tions among fault、error、failure are analyzed. In succession, how to apply with fault prevention、fault tolerance、faultremoval、fault forecasting to enhance dependability of safety critical systems are expounded concisely by diagrams. Be-cause error detecting is very important in fault tolerant systems, an error detecting technology based on safety kernelis proposed in this paper. Future trends of research in safety critical field are listed at the end.
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