In order to improve the sensitivity and reduce the time to first fix and lost reacquisition under the circumstance ofstrong Interferences and high dynamic, the GPS signal rapid acquisition technology of ultra-tight integrated navigation system aidedby SINS is researched.Firstly, the parallel rapid acquisition approach based on FFT is adopted and improved.In order to enhance theacquisition sensitivity in the week signal environment, the coherent accumulation method is utilized, and by means of the cyclic shift,average sampling and module reuse technique, the computational load and hardware resource occupy rate of the parallel rapidacquisition approach based on FFT are remarkably reduced.Secondly, the acquisition technique aided by SINS is used to shorten thetime to first fix and lost reacquisition.Finally, the simulation shows that the approaches proposed here are effective.