［Objective］This paper develops a high-performance acrylic polyurethane hull coatingand improves its key properties.［Methods］Firstly，hydroxy acrylic resins were screened for optimalweatherability through accelerated UVB aging tests that simulated outdoor exposure conditions. Then， nano-fillers were introduced and compared with conventional fillers. The volume solids content of thecoatings was tested using a density cup by the immersion method to evaluate their effectiveness inreducing density and achieving high volume solids. The enhancement effect of hexagonal boron nitridenanosheets（BNNS）was evaluated through performance tests including salt spray resistance，abrasion resistance，and seawater immersion.［Results］The formulation was finalized with hydroxy acrylic resin 1# as the primary resin，incorporating nano-fillers to partially replace conventional types. This approachresulted in a 1%-3% loading range that effectively lowered the coating density without a substantialincrease in viscosity，accomplishing the ideal profile of high volume solids，low viscosity，and low VOC. Furthermore，the incorporation of BNNS was found to significantly enhance the coating’s abrasion and corrosion resistance. Specifically，at a loading of 1. 5%，these properties were significantly improved compared to the blank sample.［Conclusion］This study presents a viable solution for developing high-performance，high-volume-solid，low-viscosity，and environmentally friendly hull coatings.