Coral reefs in the Houtman Abrolhos, situated on the western continental marlin of Australia, occupy a high latitude (29癝 and 114癊) and transitional position between cool-wager shelf carbonates to the south and more tropical environments to the north.Holocene coral reefs in the Easter Group ramge from 9m duck at the wind-ward to more than 26m at the leeward side. Lithofaeies of the windward and leeward reefs differs obviously. The windward reefs are donunated by coralline algal bindstone, whereas porous branching coral framestone farms a major part of leeward reefs. Petrological study shows that the Holocene coral reefs in the Easter Group have experienced extensive submarine cemcntation. Most of the ccmcntation characteristics are as same as, but some of them do differ from their tropical counterparts. The mmeralogies of the cements are aragonite and Mg-calcite. The types of the cements include micritic, peloidal and bladed Mg-calcite, and acicular,botryoidal, mesh and spherulitic aragonite. They are similar to those observed m tropical reefs. Mg-calcite cements are most important and volumetrically reach 96% of the total cement content. The amounts of aragonite cement are substantially reduced,compared to tropical reefs. Mg-calcite peloids are the most striking constituents.They occur extensively in the inter-and intro-granular skeletal cavities, mostly in the branching Aeropora framework of the leeward reefs. submsrme cementation in the leeward refs is significantly stronger than in the windward reefs, and is different from that iu tropical reefs. Another remarkable feature in the submarine cements is that MgCO3 contents of Mg-calcite cements (8.47-14.29mo1%) are clearly lower than those recorded in tropical reefs All the characteristics of the submarine cementation of Holocene coral reefs in the Easter Group can be reasonahlely explained with the conditions in their transitional position and high latitude.