An　integrated　slipper/swashplate　structure　is　developed　for　seawater　hydraulic　axial　piston　pump.　Considering　the　overturning　moment　of　the　integrated　slipper,　the　transient　hydrodynamic　lubrication　model　of　the　integrated　slipper　is　established,　and　the　body-fitted　grid　and　five-point　finite　difference　method　is　employed　to　accurately　solve　the　model.　An　optimization　design　method　based　on　a　hybrid　of　CFD　(Computational　Fluid　Dynamics)　and　PSO　(Particle　Swarm　Optimization)　for　the　integrated　slipper　is　proposed　for　the　interface　structure　with　the　low　leakage　and　power　loss.　The　optimal　sealing　belt　of　the　integrated　slipper　is　obtained,　and　the　leakage　and　power　loss　are　reduced　by　27.3%　and　16.7%　under　the　same　gap　size,　respectively.　The　effects　of　working　condition　on　the　film-forming　characteristics　and　power　consumption　characteristics　of　the　lubricating　film　are　analyzed　based　on　the　optimized　integrated　slipper.　It　is　found　that　the　leakage　and　total　power　loss　increase　significantly　with　the　increasement　of　working　pressure　and　shaft　speed,　and　decrease　with　the　increasement　of　temperature.　The　excellent　lubrication　characteristics　and　strong　anti-overturning　ability　of　the　integrated　slipper/swashplate　structure　can　improve　the　performance　of　the　seawater　axial　piston　pump,　and　its　optimization　design　method　proposed　in　this　study　can　provide　a　new　reference　for　engineers.