On　the　basis　of　filed　loading　test　results　of　compacted　cement-soil　pile　composite　foundation,　the　cooperation　mechanism　of　piles,　surrounding　soil　and　cushion　is　analyzed　under　vertical　load.　Analyzing　model　is　proposed　by　considering　the　distribution　behavior　of　skin　friction　between　the　pile　and　the　surroundings,　and　the　method　to　calculate　the　stress　ratio　of　piles　to　soil　is　introduced　by　considering　harmony　working　of　piles,　surrounding　soil　and　cushion　in　composite　foundation.　The　bearing　behavior　of　compacted　cement-soil　pile　composite　foundation　is　analyzed　by　using　the　analytical　method.　The　factors　influencing　the　stress　ratio　of　piles　to　soil,　such　as　cushion　modulus,　soil　modulus　of　piles　end,　rigid　ratio　of　pile　and　soil,　pile　length,　area　displacement　ratio,　are　discussed　by　calculating　stress　ratio　of　piles　to　soil.　It　is　shown　that　cushion　modulus　with　respect　to　soil　modulus　of　piles　end　has　bigger　influence　on　the　stress　ratio　of　piles　to　soil.　It　has　a　effective　length　in　compacted　cement-soil　pile　composite　foundation,　and　the　stress　ratio　of　piles　to　soil　increases　by　increasing　pile　length　and　rigid　ratio　of　pile　and　soil　at　the　same　time.