Pressure-compensating　(PC)　emitters　can　maintain　a　constant　discharge　within　a　wide　range　of　working　pressures,　thus　they　have　extensive　application　prospect　in　mountain　regions　where　the　hydraulic　pressure　in　irrigation　systems　often　changes　greatly.　Although　the　rapid　design　method　for　non-PC　emitters　based　on　CFD　is　quite　mature　at　present,　common　CFD　method　is　not　suitable　for　the　design　of　PC　emitters　because　there　exists　a　two-way　coupling　interaction　between　the　fluid　flow　and　elastic　diaphragm.　In　order　to　improve　the　design　accuracy　and　efficiency　of　PC　emitters,　the　fluid-structure　interaction　(FSI)　analysis　was　studied　in　this　paper.　In　the　FSI　analysis　procedure,　adaptive　mesh　repair　was　adopted　to　refine　the　distorted　fluid　mesh.　Incremental　method　and　displacement-pressure　finite　element　formula　were　used　for　the　nonlinear　analysis　of　the　incompressible　material.　In　this　paper,　SST　K-ω　turbulence　model　was　used　for　the　fluid　analysis,　while　contact　analysis　method　and　Neo-Hookean　Mooney-Rivlin　rubber　material　model　were　adopted　for　the　structure　analysis.　The　results　showed　that　the　discharge　was　adjusted　by　a　very　small　deformation　of　the　diaphragm　to　reach　a　steady　state.　At　last,　compared　with　the　test　results　carried　out　using　the　test　samples　made　by　rapid　prototyping,　the　analyzed　values　were　a　little　larger　while　the　maximum　relative　deviation　was　within　2.5%.　This　verified　that　PC　emitter＇s　discharge　could　be　predicted　by　FSI　analysis　accurately.　In　conclusion,　FSI　analysis　is　an　efficient　way　to　improve　the　design　accuracy　and　reduce　the　test　times　for　PC　emitters.