In　order　to　study　the　effects　of　pressure　on　the　new-type　opposed　biconical　cone　screw　seawater　hydraulic　pump,　a　three-dimensional　model　of　the　new-type　pump　and　the　corresponding　fluid　dynamics　model　were　presented.　The　flow　fields　for　different　pump　pressure　conditions　and　different　positions　of　the　cone　screw　rotor　were　numerically　simulated,　where　the　pressure　distribution　in　the　sealing　cavity　and　the　hydraulic　force　on　the　rotor　were　obtained.　Analyses　show　that,　the　pressure　distribution　divided　by　the　meshing　lines　of　cone　screws　and　bush　is　gradually　increased　from　the　inlets　to　the　outlet;　the　axial　hydraulic　forces　on　the　two　symmetrical　cone　screws　are　equal　in　magnitude　but　opposite　in　direction;　direction　of　the　hydraulic　force　on　rotor　rotates　in　the　opposite　direction　of　rotator＇s　rotation,　while　the　force　value　is　constant.