The advantages of applying fault tree analysis(FTA)to analyze the faults of ship s hydraulic devices are listed.

The technique of condition monitoring and measuring is a method, which is used in improving reliability and security of the running of hydraulic devices.

Lubrication wear failure in hydraulic equipment and its monitoring diagnoses;

Analyse the daily maintaining and diagnosing breakdown of hydraulic equipment;

Noise of hydraulic equipment and the methods for abating noise;

A conventional intelligence fault diagnosis system for hydraulic equipments usually employs two methods: expert system and nervous net, each of which has its own advantage and disadvantage.