In order to build rapid atmospheric wireless laser communication links and quickly obtain the size of uncertain capture area,GPS/INS integrated navigation system was used to complete the alignment positioning,meanwhile the alignment algorithm of this system was studied and optimized.Firstly,the working principle of GPS/INS was analyzed,the model was proposed according to capture procession,and the feasibility of the model was analyzed.Then,static initial alignment algorithm of the model was proposed.Finally,field experiment was carried out according to this algorithm.Based on the experimental results,capture model and its algorithm were calibrated,and the size of the uncertainty area was 27 mrad,which basically meets the requirements of atmospheric Wireless Laser communication of 10 km horizontal link.The capture time is less than 10 s,and it′s independent of weather.