Due　to　the　randomness　and　complexity　of　the　actual　operating　environment,　the　parameters　of　water　distribution　network　(WDN)　hydraulic　model　are　uncertain.　Based　on　the　Monte　Carlo　stochastic　simulation　method,　this　paper　proposes　an　uncertainty　analysis　method　for　WDN　hydraulic　model　considering　the　correlation　of　parameters.　Correlated　parameters　were　regarded　as　random　variables　with　specified　correlation　coefficients.　In　the　Monte　Carlo　random　sampling,　independent　normal　random　number　sampling　was　performed,　and　then　the　independent　normal　random　number　was　converted　into　the　correlated　random　number　by　inverse-Orthogonal　transformation　and　inverse-Nataf　transformation.　The　correlated　random　number　was　used　as　the　model　parameter　value　for　hydraulic　calculation.　The　effect　of　the　correlation　and　uncertainty　of　pipe　roughness　on　the　uncertainty　of　the　node　pressure　and　the　pipe　flow　in　the　WDN　hydraulic　model　was　studied.　Case　analysis　showed　that　the　correlation　of　pipe　roughness　had　a　significant　impact　on　the　uncertainty　analysis　results.　The　differences　of　the　average　fluctuation　values　of　node　pressure　and　pipe　flow　were　more　than　70%　and　60%　separately　in　correlated　and　independent　conditions.　Therefore,　the　correlation　between　model　parameters　should　be　considered　in　the　uncertainty　analysis　of　WDN.　©　2020,　Editorial　Board　of　Journal　of　Harbin　Institute　of　Technology.　All　right　reserved.