The　condensation　of　single　saturated　steam　bubble　in　quiescent　subcooled　water　was　simulated　based　on　MPS　method.　The　simulation　was　carried　out　under　different　initial　bubble　pressures　and　diameters,　and　the　shape　formation,　bubble　equivalent　diameter　and　pressure　during　condensation　were　obtained.　The　initial　bubble　pressure　ranged　from　0.1　MPa　to　0.5　MPa,　and　the　initial　bubble　diameter　was　kept　at　three　different　values　of　2　mm,　3　mm　and　5　mm.　The　pressure　and　temperature　of　the　quiescent　water　was　0.1　MPa　and　70°,　respectively.　The　results　showed　that　when　the　initial　bubble　pressure　difference　across　phase　interphase　was　zero,　the　steam　bubble　was　always　spherical　during　condensation,　the　bubble　equivalent　diameter　decreased　and　the　bubble　pressure　was　almost　constant.　Otherwise,　when　the　initial　bubble　pressure　difference　was　larger　than　zero,　the　bubble　changed　from　sphere,　heart-shape　to　semi-moon　shape　during　condensation.　The　bubble　pressure　and　equivalent　diameter　were　in　cyclic　variations,　and　the　amplitude　of　variation　increased　with　the　initial　bubble　pressure.