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Aiming at improving the reliability of marine equipment, the mechanical fault diagnosis system which based on C# platform was developed in the industrial personal computer(IPC). The hardware components include IPC, signal conditioner that were built at first. Then the interface of sampling card interface, signal processing method and graphics plotting were programmed by C#. Finally, they were debugged and experimented in marine field. Combined with marine gear fault equipment, the fault diagnosis system was used to collect signal, and signal processing software was used to analyze the time domain waveform and spectrum waveform about normal gear and wearing gear, analyze sideband of fine frequency spectrogram of fractured gear, to identify all kinds of reasons and places about gear failure. The results indicate that the diagnosis system for marine machinery equipment is effective and validated for marine failure equipment, at the same time, the results lay the foundation for the diagnosis of development process by using fault diagnosis system to diagnose bearing, diesel and other equipment with fault. [ABSTRACT FROM AUTHOR]