Because　of　the　difference　between　oil　and　water　in　physical　and　chemical　properties,　research　on　the　design　method　of　water　hydraulic　slide　valve　is　important　to　design　the　water　hydraulic　servo　valve.　Based　on　the　flow　fluid　simulation　of　incompressible　flow,　according　to　the　design　parameters　of　water　hydraulic　slide　valve,　CFD　software　Fluent　is　used　to　simulate　and　analyze　the　flow　characteristics　of　water　hydraulic　slide　valve.　The　simulation　model　of　Slide　valve　with　rectangular　openings　has　been　built,　and　different　combinations　of　boundary　conditions　are　specified　to　make　comparisons　so　as　to　ensure　the　correctness　of　the　simulation.　The　factors　which　impact　the　static　characteristics　of　slide　valve　like　the　spool　opening,　flow　coefficient,　incidence　angle　have　been　discussed.　The　results　indicate　that　the　flow　designed　of　the　slide　valve　is　approximately　proportional　to　the　spool　opening　by　rational　selection　of　structure　parameters.　The　structure　parameters　of　the　slide　valve　that　satisfy　the　design　requirements　are　derived.