The micro-scale and low cost micromachining gyro is widely used in the attitude stabilization and control system of Microsystems. The signal processing technology for the non-driven silicon micromachining gyro is studied. The signal for 3D attitude angular velocity of the roll, pitch and yaw of the rotating carrier is extracted and output by hardware circuits, software algorithm and compensation technique. The gyro is used in the attitude measurement and control technology fields of the rotating carrier.