This　paper　propose　a　method　to　study　the　dynamic　characteristics　of　two-phase　flow　though　the　signals　which　collected　from　acoustic　emission.　With　the　digital　processing　to　extract　the　feature　of　time　domain　and　wavelet　energy　to　analysis.　the　characteristic　of　flow.　At　last,　get　the　relationship　of　Frg　and　flow　status.　Though　study　the　pressure　loss　of　vertical　direction　get　the　model　of　interphase　force.　Different　flow　pattern　with　different　characteristic　of　dynamic　of　flow.　Acoustic　emission　could　be　a　new　method　to　study　the　two　phrase　flow　in　the　future.