Aimed at the low noise design requirements of water-lubricated bearings in the submarine propulsion system,modified polyamide（PA）bearing materials and bearing prototypes were developed.The tribological properties of the PA material sample were studied by a multi-functional friction and wear tester,and were compared with the tribological properties of the NBR and Thordon SXL materials.The speed and load characteristic test of the PA bearing prototype were carried out on the water-lubricated bearing test bench,and the friction coefficient and vibration characteristic data under different specific pressure and speed were obtained.The results show that the modified PA material has the advantages of small friction coefficient and low wear rate compared with NBR and Thordon SXL material.At low speeds,the friction coefficient of water lubricated bearings decreases with the increase of speed and increases with the increase of specific pressure.After the speed increases to 100 r/min,the trend of friction coefficient change gradually slows down.The research results provide a reference for the design of low-noise water-lubricated stern bearings for submarine.