A　method　for　the　simultaneous　determination　of　7　benzoylurea　pesticides　(chlorfluazuron,　diflubenzuron,　fluazuron,　flufenoxuron,　hexaflumuron,　teflubenzuron　and　triflumuron)　in　the　manufactured　Oolong　tea　leaves　and　its　infusion　was　described.　The　method　has　a　LOD　of　0.03-1.00　ng/mL,　a　recovery　of　90.4-103%　for　made　tea　and　90.3-102%　for　tea-infused　liquid,　respectively.　By　using　the　proposed　method,　the　leaching　characteristics　of　above　7　pesticides　during　infusing　process　were　investigated.　The　experimental　results　revealed　that:　(1)　diflubenzuron　can　be　most　easily　extracted　out　during　infusing　process,　followed　by　triflumuron,　teflubenzuron,　hexaflumuron,　chlorfluazuron,　flufenoxuron　and　fluazuron.　(2)　The　leaching　of　flufenoxuron　and　chlorfluazuron　during　infusing　process　seems　to　be　controlled　by　only　their　solubility,　whereas,　the　leaching　of　other　5　benzoylurea　insecticides　was　primarily　controlled　by　their　partitioning　coefficient　between　made　tea　and　hot　water.　The　results　of　this　study　are　helpful　for　the　accurate　evaluation　of　the　safety　of　Oolong　tea.　(C)　2013　Elsevier　Ltd.　All　rights　reserved.