with the accumulation of working hours ,the performance of shore defense equipment will inevitably decrease ,the BITE system of equipment can monitor the failure of main equipment ,but it can not give qualitative or quantitative description and evaluation for sub-health performance.thesub health status of shore defense equipment can not be qualitatively and quantitatively monitored and evaluated .by means of statistical analysis and pattern recognition , combined with comprehensive factors such as specific evaluation objects ,operation status and events ,the status of components , subsystems and systems is evaluated . the failure ,variation and development of each component and subsystem of shore defense equipment are given ,the results of health status assessment of typical coastal defense equipment are given ,and some suggestions for near-term equipment maintenance are put forward to provide method support for the support characteristics of coastal defense equipment .