In　order　to　detect　the　flow　state　and　concentration　distribution　of　gas/liquid　two-phase　flow　in　the　process　industry,　ultrasonic　tomography　technique　was　used　to　simulate　gas/liquid　two-phase　flow.　Considering　the　influence　of　the　number　of　sensors　on　the　quality　of　image　reconstruction,　a　contrastive　study　of　sensors　number　was　completed　at　first.　Results　show　that　the　more　the　number　of　sensors,　the　better　the　quality　of　image　reconstruction　is.　Then,　the　linear　back　projection　(LBP)　algorithm　was　used　to　reconstruct　different　flow　patterns　and　the　adaptive　threshold　filtering　(ATF)　algorithm　was　introduced　to　improve　reconstruction　images.　Finally,　the　correlation　coefficients　between　the　binarized　images　and　the　standard　images　after　threshold　processing　were　calculated.　Results　show　that　LBP　algorithm　can　effectively　reconstruct　the　image　of　various　flow　patterns,　and　the　ATF　algorithm　can　significantly　improve　the　imaging　quality.　©　2018,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.