A　physical　model　for　flow　characteristics　analysis　of　labyrinth-channel　emitter　is　reconstructed　by　Reverse　Engineering　from　an　injection　molded　part,　and　both　laminar　flow　and　turbulence　models　are　adopted　to　simulate　the　flow　state　under　the　condition　of　low　Reynolds　numbers.　According　to　the　distribution　of　separation　and　reattachment　points,　the　onset　of　transition　from　laminar　to　turbulent　flow　in　labyrinth　channels　occurs　at　a　range　of　Re=250　similar　to　300.　Furthermore,　a　visualization　system　of　the　flow　field　inside　the　labyrinth　channels　is　also　established　and　two　kinds　of　tracers　are　used　in　the　experiments.　The　experiment　of　tracing　particles　verifies　the　calculated　flow　field　distribution,　and　another　experiment　using　dyeing　liquor　showed　the　critical　Reynolds　number　characterizing　the　transition,　which　is　reasonably　consistent　with　numerical　simulation　results.　The　critical　Reynolds　number　obtained　shows　the　fact　that　the　flow　inside　this　emitter　is　turbulent　under　the　pressures　of　40　similar　to　150　kPa.