This　paper　investigates　the　shrinkage　behavior　of　ultra-high　performance　concrete　(UHPC).The　test　parameters　are:(i)　curing　condition　(sealed　or　unsealed),(ii)　steel　fiber　volume　(0%,1%,2%,3%,4%　and　5%),(iii)　water-to-binder　ratio　(0.16,0.18,0.20　and　0.22),and　(iv)　fly　ash　content　(0%,15%,30%,45%　and　60%).Results　from　the　test　indicate　that:(1)　Both　the　autogenous　shrinkage　and　drying　shrinkage　of　UHPC　develop　rapidly　at　early　ages.The　autogenous　shrinkage　at　14　days　is　80%　to　90%　of　that　at　114　days,while　the　drying　shrinkage　remains　approximately　constant　after　6　days.(2)　The　effect　of　curing　condition　is　more　significant　or　autogenous　shrinkage　(the　autogenous　shrinkage　under　the　sealed　condition　is　82.8%　of　that　under　unsealed　condition).(3)　The　steel　fiber　volume　has　no　obvious　effect　on　the　autogenous　shrinkage,but　influences　the　compressive　strength　of　UHPC.(4)　Increasing　the　water-to-binder　ratio　or　fly　ash　content　results　in　the　decrease　of　concrete　compressive　strength.And　(5)　The　fly　ash　changes　the　shrinkage　responses　and　results　in　＂lag　effect＂.The　test　results　are　used　to　modify　existing　models　for　predicting　the　autogenous　shrinkage　of　UHPC.The　modified　model　provides　a　valuable　reference　for　design.　©　2018,　The　Editorial　Board　of　Journal　of　Basic　Science　and　Engineering.　All　right　reserved.