Amensalism,　a　critical　interspecific　interaction　where　one　species　is　harmed　while　the　other　remains　un-affected,　has　been　extensively　modeled,　yet　the　synergistic　effects　of　behavioral　adaptations　like　fear　and　refuge　strategies　remain　underexplored.　This　study　proposes　an　enhanced　Lotka-Volterra　amensalism　model　integrating　fear-dependent　refuge　dynamics　(modeled　via　a　saturation　function　s(y)=smaxky)　and　1+ky　e　bidirectional　fear　regulation　(suppressing　birth　rate1and　1+k1　y　enhancing　mortality　(1　+　k2y)e2).　Theoretical　analysis　reveals　that　sufficient　refuge　capacity　(smax)　enables　the　victim　species　to　stabilize　coexistence　by　mitigating　amensalistic　harm,　while　fear　effects　induce　bifurcations　through　dual　physiological-behavioral　pathways.　Numerical　simulations　demonstrate　critical　thresholds　for　extinction-persistence　transitions,　governed　by　smax/k　synergies　and　fear　coefficients　k1,　k2.　Key　findings　include:　(1)　Refuge　effects　dominate　in　reducing　direct　harm,　(2)　Fear-refuge　interactions　destabilize　equilibria　under　high　stress,　and　(3)　Global　stability　of　the　positive　equilibrium　ensures　long-term　coexistence　if　∆　＞　0.　This　work　advances　ecological　theory　by　unifying　behavioral　adaptations　into　amensalism　dynamics　and　offers　actionable　insights　for　biodiversity　conservation,　such　as　optimizing　refuge　resources　to　buffer　species　against　anthropogenic　stressors.　©　2025,　International　Association　of　Engineers.　All　rights　reserved.