The　scaled　wind　turbine　(SWT)　is　widely　used　in　the　study　of　the　offshore　floating　wind　turbine　(OFWT).　However,　the　common　SWT　inevitably　faces　the　problem　of　Reynolds　number　effect　(RNE)　which　makes　the　rotor　thrust　lower　than　the　target　value.　To　avoid　this　problem,　a　specific　blade　with　better　thrust　performance　should　be　designed.　For　this　idea,　an　optimization　method　for　the　design　of　blade　of　SWT　is　proposed　in　this　study.　Firstly,　the　lift　and　drag　coefficients　of　variable　airfoils　are　compared　to　select　a　prefer　airfoil　for　the　blade　design.　Secondly,　the　chords　and　twists　of　the　selected　airfoil　along　the　blade　are　optimized　through　pattern　search　method　(PSM).　To　validate　the　effectiveness　of　the　method,　an　optimized　blade　of　the　SWT　designed　with　a　geometric　scaling　ratio　of　1:50　based　on　the　NREL-5 MW　baseline　wind　turbine,　is　taken　as　an　example　in　this　study.　The　aerodynamic　performance　of　the　optimized　blade　is　analyzed　and　compared.　Results　show　that　the　thrust　performance　of　the　optimized　blade　is　consistent　with　the　prototype.　The　optimization　method　can　be　used　to　design　the　blade　of　other　SWT　with　any　ratio　in　the　model　tests.　©　2022,　The　Author(s),　under　exclusive　license　to　Springer　Nature　Singapore　Pte　Ltd.