Performance　improvement　of　integrated　inertial　navigation　system　utilizing　Micro-Electro-Mechanical-System　(MEMS)　and　GPS　is　described　in　this　paper.　Our　method　is　based　on　using　a　Neural　Network　(NN)　to　intelligently　aid　the　GPS/INS　coupled　navigation　system　in　the　outages　of　GPS　signals.　First　the　model　is　built,　the　input　of　Neural　Network　is　the　same　as　the　input　of　inertial　navigation,　the　needed　parameters　can　be　gotten　through　the　network　training　and　combination　with　the　Kalman　filter　to　aid　the　INS/GPS　coupled　with　the　navigation　system.　The　test　results　indicate　that　the　proposed　methods　can　efficiently　compensate　for　GPS　updates　during　short　outages.　The　simulation　results　show　the　effectiveness　of　the　method.