Abstract: The paper provides the analysis and summary of the ensuring of the ARMS reliability through reliability design of module,redundancy design of system and state monitoring,periodical maintenance,periodical experiment,corrective repair,technological improvement in the view of Reliability-Centered Maintenance（RCM）,integrating the working practice of commissioning,operation and maintenance,and puts forward some propositions in the information collection,equipment classification,preparation of personnel about the application of RCM for ARMS maintenance in the future.