ExactquantumcalculationsofreactionprobabilitieshavebeencarriedoutusinghypersphericalcoordinatesforthecollinearrreactionO+HCl(v<1)-OH(v’<1)+Cl.AgeneralizedLEPSpotentialenergysurfacewithabarrierheightof8.12kcal/molhasbeenusedinthecalculations.Accordingtothecalculatedresultswefoundthat(1)thereactionprobabilityoscillateswithenergy,(2)thereactionprobabilityshowsvibrationaladiabaticity,althoughitispoorerthanthatforsymmetricreactionCl+HC1.Theanalysisofresonancehasalsobeendone.ThereactionrateconstantsandaveragecrosssectionshavebeencalculatedbyTST-CEQmethod.TherateconstantsareinagreementwiththatbyQCTandsmallerthantheexperimentalone.Finally,thethresholdhasbeenestimatedandisingoodagreementwiththatoftheliterature.