Direct　contact　condensation　(DCC)　of　steam　jet　in　subcooled　water　flow　in　a　channel　was　experimentally　studied.　The　main　inlet　parameters,　including　steam　mass　flux,　water　mass　flux　and　water　temperature　were　tested　in　the　ranges　of　200-600　kg/(m(2)　s),　7-18　x　10(3)　kg/(m(3)　s),　288-333　K,　respectively.　Two　unstable　flow　patterns　and　two　stable　flow　patterns　were　observed　via　visualization　window　by　a　high　speed　camera.　The　flow　patterns　were　determined　by　steam　mass　flux,　water　mass　flux　and　water　temperature,　and　the　relationship　between　flow　patterns　and　flow　field　parameters　was　discussed.　The　results　indicated　that　whether　pressure　or　temperature　distributions　on　the　bottom　wall　of　channel　could　represent　different　flow　patterns.　And　the　position　of　pressure　peak　on　the　bottom　wall　could　almost　represent　the　condensation　length.　The　upper　wall　pressure　distributions　were　mainly　dependent　on　steam　and　water　mass　flux;　and　the　upper　wall　temperature　distributions　were　affected　by　the　three　main　inlet　parameters.　Moreover,　the　bottom　wall　pressure　and　temperature　distributions　of　different　unstable　flow　patterns　had　similar　characteristics　while　those　of　stable　flow　patterns　were　affected　by　shock　and　expansion　waves.　The　underlying　cause　of　transition　between　different　flow　patterns　under　different　inlet　parameters　was　reflected　and　discussed　based　on　pressure　distributions.　(C)　2015　Elsevier　Inc.　All　rights　reserved.