Abstract: In this paper an initial alignment scheme for inertial navigation systems with single-axile-stabilization is proposed. The alignment process is separated into two steps. Firstly, the signal of transverse accel-erometer is used to leved the transvers axis around the stabilizing axis of the inertial measurement unit （IMU）. Secondly, the pitch angle is calculated by using the signal of longitudinal accelerometer and azimuth angle is calculated by using the controled angular rate enforced on the stabilization gyro.Two different system construct schemes is provided, the steady state ofeach scheme is analysed by means of developed dynamic equations of IMUwith single-axile-stabilization.The calculation methods of pitch angle andazimuth angle as well as the key influential factors on its accuracy arestudied.