Abstract: The gimbal ring and drive axis is impossible to coincide with the centre axis of gyroscope completely during the assembly process. The movement equation of the dynamically tuned gyroscope considering of the disturbing of fixing tilt angle with the theoretical mechanics was set up based on the analysis of pressure on the rotor and the gimbal ring, and the discussion were also carried out. The analysis results indicate that fixing tilt angle of gyroscope and gimbal ring have influence on the tuned condition of dynamically tuned gyroscope (DTG), and the disturbing torque is unrelated with the state of motion however it is related with the active force of torquer to rotor. Thus, it is better to have the centre axis of gyroscope coincided with the gimbal ring and drive axis to reduce the influence to the dynamically tuned gyroscope.