The　mechanical　and　hydrodynamic　characteristics　of　single-piece　nets　are　key　to　the　design　and　optimization　of　offshore　aquaculture　net　cages.　A　numerical　approach　for　offshore　submerged　aquaculture　net　materials　based　on　the　Morison　equations　and　finite　element　is　proposed,　simulating　the　hydrodynamic　characteristics　of　single-piece　nets　under　varying　parameters　such　as　wire　diameter,　mesh　size,　and　flow　velocity,　and　simulating　the　impact　of　marine　organism　attachment　on　nets　by　modifying　the　drag　coefficient.　The　simulation　results　of　nets　made　from　materials　such　as　Copper–Zinc　Alloy　(Cu-Zn),　Zinc–Aluminum　Alloy　(Zn-Al),　Semi-Rigid　Polyethylene　Terephthalate　(PET),　and　Ultra-High　Molecular　Weight　Polyethylene　(UHMWPE)　are　compared,　which　provides　a　theoretical　basis　for　optimizing　design　parameters　and　selecting　materials　for　nets　based　on　force　conditions　and　hydrodynamic　characteristics.　The　simulation　results　indicate　that　the　current　force　on　the　net　is　positively　correlated　with　flow　velocity;　the　maximum　displacement　of　the　net　is　also　positively　correlated　with　the　flow　rate.　Compared　to　other　materials,　the　Cu-Zn　net　is　subjected　to　the　greatest　water　flow　force,　while　the　UHMWPE　net　experiences　the　greatest　displacement;　the　larger　the　diameter　of　the　netting　twine,　the　greater　the　current　force　on　the　net;　the　mesh　size　is　inversely　related　to　the　current　force　on　the　net.　With　increasing　drag　coefficient,　both　the　maximum　displacement　of　the　net　and　the　current　force　experiences　increase,　and　UHMWPE　material　nets　are　more　sensitive　to　increases　in　the　drag　coefficient,　which　indicates　a　greater　impact　from　the　attachment　of　marine　organisms.　The　density　and　elastic　modulus　of　the　netting　material　affect　the　rate　of　increase　in　force　on　the　net.　The　research　results　can　provide　a　basis　for　further　research　on　material　selection　and　design　of　deep-sea　aquaculture　nets.　©　2025　by　the　authors.