Through　INSTRON1304　electric　hydraulic　servo　fatigue　testing　machine,　the　fatigue　experiment　of　soil-cement　is　done,　and　the　ultrasonic　velocity　of　soil-cement　under　dynamic　loading　is　obtained.　The　results　show　the　ultrasonic　wave　velocity　through　the　cemented　soil　samples　free　surface　obviously　attenuates　as　the　cycles　of　the　dynamic　loading　increases.　Based　on　the　damage　variable　defined　by　the　ultrasonic　wave　velocity,　the　evolution　equation　of　soil-cement　accumulated　fatigue　damage　is　established.　The　equation　indicates　that　the　fatigue　damage　of　soil-cement　l　under　dynamic　loading　can　obviously　be　divided　into　three　stages:　the　initial　rapid　decay　of　the　initial　state,　stability　decay　and　rapid　damage　close　to　the　destruction.　The　experiment　results　provide　an　important　reference　for　non-destructive　testing　of　soil-cement　under　dynamic　loading.