The　existing　earthquake　damage　investigations　indicate　that　the　lateral　spreading　of　site　is　more　likely　to　occur　in　inclined　liquefiable　site　under　earthquake,　therefore　the　way　of　foundation　reinforcement　is　often　adopted　to　reduce　the　lateral　spreading　phenomenon　of　inclined　liquefiable　site.　In　order　to　study　the　reinforcement　principle　of　inclined　liquefiable　site　by　the　two　reinforcement　methods　of　concrete　pile　and　gravel　pile,　based　on　the　verified　numerical　model　of　free　field　model,　the　model　of　concrete　pile　reinforcement　and　crushed　rock　pile　reinforcement　was　established,　the　dynamic　response　and　reinforcement　effect　of　two　different　reinforcement　methods　in　inclined　liquefiable　site　were　analyzed,　and　the　effects　of　buried　depth　and　pile　diameter　on　the　earthquake　dynamic　response　and　the　effects　of　different　reinforcement　models　are　discussed.　It　is　found　that　the　concrete　pile　has　a　better　reinforcement　effect　on　inclined　liquefiable　site　than　gravel　pile　under　the　same　buried　depth　and　pile　diameter.　When　the　concrete　pile　is　adopted　to　reinforce　the　inclined　liquefiable　site,　the　reinforcement　effect　is　better　when　the　concrete　pile　are　embedded　in　dense　sand　layer　at　a　certain　depth;　When　adopting　the　gravel　pile　to　reinforce　inclined　liquefiable　sites,　the　effect　is　better　when　only　clay　and　loose　sand　layer　are　reinforced,　moreover,　increasing　the　diameter　of　gravel　piles　greatly　improves　the　reinforcement　effect　of　inclined　liquefiable　sites.　The　pile　group　reinforcement　model　can　greatly　reduce　the　lateral　displacement　of　site　soil　compared　with　the　single　pile　reinforcement　model.