Hydraulic system is widely used in military equipment,and also plays an important role in the reliability of military equipment.With the development of artificial intelligence technology,the performance degradation prediction technology of hydraulic system has been effectively promoted.The performance degradation prediction technology of hydraulic system was described,the commonly used methods of this technology were introduced,and its advantages and disadvantages were introduced as well as the representative research and application.In view of the application of hydraulic system performance degradation prediction technology in military equipment,the representative research results were listed.The problems and shortcomings of this research direction were described.Finally,the future development direction of this technology was prospected.