Using tribloek copolymer F127 and eationie polymerie nanolatex(CPN) as templates, and tetraethylorthosilieate ( TE0S)as the precursor, Si0, solswereprepared in an acid-catalyzed aleohol system, The filmsystem structure was built using Filmstar thin film design software, and a double-ayer broadband antireflectivemesoporous Si0, film with preeisely controllable thickness was prepared on a quartz substrate using the dip-coating method.The morphology, structure , and optical properties of the film were characterized and analyzedusing atomie foree microseopy ( AFM) , seanning eleetron mieroscopy ( SEM ) , transmission eleetron mieroscopy( TEM ) , N, adsorption-desorption analyzer, and [V-visible-near-infrared speetrophotometer.The results showthat the average transmitance of the double dayer mesoporous $i0, antirellective film can reach up to 98,996 inthe 300~800 nm range.