Only　a　few　research　studies　have　been　conducted　into　the　lateral　pressure　on　formwork　of　concrete　subjected　to　ultra-deep　vibration,　and　great　differences　exist　in　the　determination　of　form　pressures　and　vibration　depth　in　the　current　national　codes.　This　paper　presents　experimental　results　of　five　60　cm　x　60　cm　x　300　cm　specimens　of　concrete　columns　to　investigate　the　effect　of　ultra-deep　vibration　on　the　form　pressure.　Based　on　the　vibrating　liquefaction　and　hydrostatic　pressure　balance　theory,　a　calculation　model　of　the　form　pressure　under　ultra-deep　vibration　is　established　and　a　relevant　calculation　formula　is　proposed.　The　calculation　results　are　compared　with　the　test　data.　The　results　show　that　the　vibration　depth　has　a　significant　effect　on　the　lateral　pressure　of　freshly　placed　concrete.　The　pressure　at　the　vibrator　head　does　not　vary　linearly　with　the　increasing　vibration　depth　and　is　smaller　than　the　equivalent　hydrostatic　pressure　exerted　by　fresh　concrete.　It　is　proved　that　the　proposed　calculation　method　gives　a　reasonable　prediction　of　the　lateral　pressure　of　columns　at　the　head　location　of　ultra-deep　vibration.