In traditional orbit hydraulic motor,mechanical flow distribution is used,resulting in high mechanical and volume loss.At the same time,the motor has a large size and difficulty in processing.Based on this,a hydraulic motor that used a high-speed electromagnet valve group to achieve digital distribution and speed adjustment was studied.The operating mechanism and structural characteristics of the digital distributed hydraulic motor were analyzed;on the basis of the theoretical analysis of the orbit motor and the electromagnetic valve flow characteristics,a valve-motor dynamic model was established to simulate the proposed model;on the basis,the characteristics of the distribution and steering switching of the orbit motor were studied;by changing the PWM duty cycle,the orbit motor can better achieve two-way speed regulation.Compared with mechanical matching orbit motors,structural complexity of the orbit hydraulic motors with digital distribution has greatly reduced and the flexibility of streaming and speed adjustment is enhanced.