Reducing　the　inlet　water　pressure　of　the　district　metering　area　(DMA)　can　be　achieved　by　fixed　outlet　pressure　control　and　intelligently　flow　modulated　pressure　control　respectively　to　reduce　leakage　in　water　distribution　system.　In　order　to　weaken　temperature　factor　influence　on　the　benefit　analysis　from　pressure　management　field　study,　a　new　methodology　is　proposed　in　this　paper　which　is　based　on　some　theories,　such　as　regression　forecasting　theory,　minimum　night　flow　(MNF)method,　Bursts　and　Background　Estimates　(BABE)　and　Fixed　and　Variable　Area　Discharges　(FAVAD)　concepts.　The　methodology　allows　assessment　of　the　reduction　of　water　supply　and　the　pressure　reduction　rate　in　the　critical　point　by　two　pressure　control　techniques.　Moreover,　the　differences　of　two　pressure　management　are　comprehensively　analyzed,　and　the　benefits　yielded　by　flow　modulated　pressure　control　are　more　than　the　other.　©　ASCE　2013.