An　elaborated　structural　numerical　model　of　NREL　5MW　offshore　wind　turbine　(OWT)　with　monopile　foundation　is　established　by　using　the　code　of　ABAQUS.　The　blade　stiffness　is　adjusted　by　changing　the　elastic　modulus　of　blade,　and　the　influences　of　blade　stiffness　change　on　the　natural　frequency　of　the　wind　turbine　(WT)　structure　are　analyzed.　The　results　show　that　the　change　of　blade　stiffness　can　significantly　change　the　dynamic　property　of　blade　itself　and　supporting　structure　for　WT　in　the　FA　(Fore-Aft)　direction.　For　the　1st　bending　mode　of　supporting　structure,　the　natural　frequencies　in　the　FA　and　SS　(Side-to-Side)　direction　increase　monotonically　with　the　increasement　of　blade　stiffness;　in　terms　of　the　2nd~5th　bending　modes　of　the　supporting　structure,　the　FA　natural　frequencies　are　more　sensitive　to　the　change　of　blade　stiffness,　while　the　SS　natural　frequencies　are　basically　independent　on　blade　stiffness.　©　2021　IEEE.