The structural features of a new type of offset radial piston motor was introduced. The displacement, torque and kinetic characteristic of the motor piston theory was analyzed, the results show that the motor has characteristics of good startup performance at low speed, good sliding performance with sliding boots, smooth operation, low noise and so on, so the performance is superior to the general motor of low speed and high torque, and compared with other types of hydraulic motor, its lifetime increases, it is also easier to produce and repair, except for the common hydraulic system, under certain conditions can also be used in pure water hydraulic system.