The gyro drift and random error are the primary factors which influence the performance of the dynamically tuned gyroscope north finding system.The triposition north finding scheme is proposed to eliminate the effect of gyro drift on the northfinding.Preparetime,sampletime,lowmoment holding voltage and blockrotation time can affect the time and the precision of north finding.These Parameters can be set to decrease gyro random error by testing data.The test results show that the precision of north finding is raised from 0.2° to 0.05°.