Environmental　and　ecological　issues　caused　by　water　resources　crisis　have　brought　enormous　challenges　to　the　sustainable　development　of　water-deficient　area.　Water　resources　allocation　management　balancing　the　relationship　between　the　social-economic　development　and　the　ecological　environment　has　become　a　hot　topic　in　recent　years.　In　this　paper,　an　inexact　fuzzy　chance-constrained　programming　(IFCCP)　approach　is　proposed　for　regional　water　resource　allocation　optimization　with　the　aim　of　promoting　the　harmonious　development　of　the　social　economic　and　the　ecological　environment,　improving　water　utilization　efficiency,　and　realizing　water　resources　consumption　control　under　uncertainties.　The　method　is　incorporated　with　interval　parameter　programming,　fuzzy　programming,　and　chance-constrained　programming,　for　handling　system　uncertainties　and　balancing　the　optimal　objectives　with　the　risk　of　violating　system　constraints.　Under　this　framework,　an　IFCCP　model　for　water　resources　allocation　management　was　successfully　formulated　and　applied　to　a　typical　water-deficit　area,　Tianjin,　China,　for　obtaining　a　better　water　resources　plan　among　multiple　users　under　resources　and　environmental　limitation.　Different　total　water　consumption　control　policies　are　designed　for　assessing　regional　water　allocation　schemes.　The　results　indicated　that　the　gap　of　supply　and　demand　will　only　be　solved　by　foreign　water,　the　transferred　water　from　Luan　River　and　Changjiang　River　would　still　be　the　main　supplier　in　planning　horizon.　Moreover,　the　strict　total　water　consumption　control　policy　would　guarantee　the　water　requirement　of　ecological　environment,　lead　to　changes　in　the　structure　of　water　supply,　actively　guide　on　water　conservation,　and　promote　the　large-scale　utilization　of　desalted　water　and　recycle　water.