In　this　paper,　we　consider　an　impulsive　model　of　plankton　allelopathy　with　delays.　By　applying　the　comparison　theorem　and　constructing　some　suitable　Lyapunov　functional,　we　discuss　the　permanence　and　global　attractivity　of　the　system.　Our　result　generalizes　the　corresponding　one　of　Abbas　et　al.　(Nonlinear　Dyn　67:　203–214,　2012).　We　also　obtain　sufficient　conditions　ensuring　the　existence　of　a　unique　strictly　positive　almost　periodic　solution　based　on　almost　periodic　functional　hull　theory　of　the　impulsive　differential　equations.　For　the　system　without　delays,　our　results　weaken　those　of　He　et　al.　(Nonlinear　Anal　11:　2296–2301,　2010).　©　2017,　Korean　Society　for　Computational　and　Applied　Mathematics.