This paper presented a stabilized platform with five UPS active limbs and one RRS passive limb based on the characteristics of the ship movement. First, the stabilized platform’s prototype is presented and the inverse position formulas are derived. Then the inverse/forward velocities, inverse/forward accelerations formulas of the stabilized platform are derived. Third, examples for solving the length, velocity and acceleration of the active limbs are derived and the result shows that the proposed mechanism has good kinematic characteristic.