Oolong　tea　is　a　semi-fermented　Chinese　traditional　tea　with　strong　refreshing　taste　and　health　benefits.　With　the　development　of　oolong　tea　industry,　its　health　functions　are　increasingly　attracting　the　attention　of　the　scientific　researchers　at　home　and　abroad.　Oolong　tea　and　its　components　possess　antioxidant　activity,　body　weight　control,　anti-cardiovascular　disease,　antidiabetic,　antimutagenic,　anticarcinogenic,　antiallergic,　antibacterial　and　antiviral　properties,　as　well　as　effects　of　regulating　intestinal　microflora,　all　of　which　are　reviewed　in　this　paper.