Silver nanostructure compact aggregates on the surface of quartz glass substrates were synthesized by small gold seeds with the assistance of poly vinypyrrolidone (PVP) and irradiation of fluorescent lamp.The formation mechanism of silver nanostructure was proposed.The results show that both the PVP and the light irradiation are the keys to in-situ growth of silver nanostructure on quartz glass substrates.The silver nanostructure of the substrates which finally grow up to 150 nm after 20 h irradiation exhibits irregular shape,and some of nanoparticles stack to form bilayer.A new broad band appears in the absorption spectra of the substrates due to the interparticle dipole-dipole coupling of surface plasmon resonance response of the triangular silver nanoplate particles,which red shifts 600-800 nm as the particles grow up.The substrates have an emission band centered at 400 nm on their fluorescence spectra,and the fluorescence intensity shrinks as the average size of the silver nanostructure increases.The strongest SERS signal of SERS-active substrate is fabricated after 16 h.