A　new　type　of　water　hydraulic　proportional　throttle　valve　is　designed.　The　mathematical　models　of　steady-state　control　characteristic,　flow　characteristic　and　load　characteristic　for　the　new　designed　water　hydraulic　proportional　throttle　valve　are　established,　in　addition　some　main　factors　influencing　steady-state　characteristic　are　determined,　and　some　steady-state　characteristic　analysis　such　as　displacement　initial　current,　flow　initial　current,　dead　zone　and　hysteresis　and　other　characteristic　is　also　proceeded.　The　analysis　and　emulation　show　that　spool　displacement　has　a　good　linear　relation　with　input　current,　and　that　the　output　flow　of　water　proportional　throttle　valve　is　not　only　related　to　type　of　valve　port,　but　also　affected　by　working　pressure　difference.　In　order　to　gain　better　steady-state　characteristic,　the　working　pressure　difference　of　valve　port　should　be　compensated　or　closed-loop　control　should　be　adopted.　The　result　is　of　great　instructive　significance　for　optimizing　design　parameters　of　the　water　hydraulic　proportional　throttle　valve,　analyzing　dynamic　characteristic　and　designing　control　system.