In this work,a fast an d accurate stationary alignment method for strapdown inertial navigation system (SINS) is proposed.It h as been demonstrated that the stationary alignment o f SINS can be improved by employing the multipositio n technique,but the alignment time of the azimuth error is relatively longer.Over here,the two-posi tion alignment principle is presented.On the basis of this SINS error model,a fast estimation algorithm of the azimuth error for the initial a lignment of SINS on stationary base is derived f ully from the horizontal velocity outputs and the output rates,and the novel azimuth error estimatio n algorithm is used for the two-position alignment. Consequently,the speed and accuracy of the SINS’ s initial alignment is enhanced greatly.The computer simulation results illustrate the efficiency of this alignment method. In this work, a fast an d accurate stationary alignment method for strapdown inertial navigation system (SINS) is proposed. I h as been demonstrated that the stationary alignment of SINS can be improved by employing the multipositio n technique, but the alignment time of the azimuth error is relatively longer. Over here, the two-posi alignment alignment principle is presented. On the basis of this SINS error model, a fast estimation algorithm of the azimuth error for the initial a lignment of SINS on the stationary base is derived f ully from the horizontal velocity outputs and the output rates, and the novel azimuth error estimations n algorithm is used for the two-position alignment. the speed and accuracy of the SINS ’initial alignment is enhanced greatly. The computer simulation results illustrate the efficiency of this alignment method.