The overall design scheme of the large journal bearing testbed was presented,and the designed testbed included five systems,mechanical structure,drive system,lubrication system,control system and acquisition system.Finite element simulation was used to analyze the rationality of the design of the testbed.The technologies of digital modeling,simulation software,electrical control,sensors and signal processing were used to ensure the stability and reliability of the developed testbed.Through analyzing the corresponding test data,including rotational speed,temperature,pressure,displacement and vibration acceleration,the effectiveness of the testbed was verified,indicating that the developed testbed can meet the normal and stable operation requirements of large dynamic pressure sliding bearing.