An　one-dimensional　soil　layer　model　is　employed　to　analyze　the　site　effects　of　the　designing　ground　motion　in　five　kinds　of　non-hard　rock　sites,　including　firm　rock　site,　soft　rock　site,　upper　bound　soft-to-medium　soil　site,　soft-to-medium　soil　site　and　soft　soil　site,　for　designing　the　foundation　of　AP1000　nuclear　island　(NI)　structure.　In　this　study,　the　shear　wave　velocity　in　the　bedrock　of　the　computational　model　is　selected　as　700,　1　100　or　2　438　m/s.　The　input　motion　of　the　bedrock　is　taken　as　RG1.60,　AP1000　and　HAD101　spectra　(with　5　damping　ratios)　matching　with　the　synthetic　acceleration　time　histories　of　ground　motion　provided　in　the　relative　technical　documents　and　standards,　respectively.　Analytical　results　indicate　that　non-hard　rock　sites　induce　the　significant　changes　of　the　peak　ground　acceleration　and　response　spectrum　of　the　ground　motion,　which　is　enhanced　further　by　a　softer　site.　The　effects　of　non-hard　rock　sites,　except　the　soft　sites,　amplify　the　peak　ground　acceleration　and　response　spectrum.　However,　the　effect　of　the　soft　site　increases　the　peak　ground　acceleration　and　response　spectrum　in　a　lower　frequency　range,　and　it　is　opposite　in　a　higher　frequency　range.　The　peak　ground　acceleration　and　response　spectrum　of　the　site　ground　motion　are　significantly　influenced　by　the　changes　of　the　bedrock　and　its　shear　wave　velocity　of　all　non-hard　rock　sites.　Moreover,　the　effect　is　proportional　to　the　shear　wave　velocity　of　the　bedrock,　and　the　ground　motion　decreases　obviously　with　the　increase　of　shear　wave　velocity.　The　ground　motion　is　unaffected　by　the　shear　wave　velocity　as　the　site　changes　from　hard　to　soft.　Considering　the　great　effects　of　the　site　type　and　the　bedrock　selection　on　ground　motion,　it　is　thus　necessary　to　analyze　the　applicability　of　the　sites　by　using　the　AP1000　standard　design　in　the　nuclear　power　plant　construction　in　China.　©,　2015,　Academia　Sinica.　All　right　reserved.