ultrasonic agitation and spin-coating methods were used to insert polymethylmetacrylate into pores of porous silicon by physical adsorption methods. The influence of the porosity of porous silicon
rotary speed of spin-coating and solution concentration on inserting of PMMA in the porous silicon pores were studied in this paper. Variation of photoluminescence spectra and stability of samples after inserting PMMA was analyzed.