Porous 7Na 2 O–23B 2 O 3 –70SiO 2 glass was successfully fabricated by acid leaching treatment and phase-separation. The 2mol/l hydrochloric acid (HCl) solution treatment was used for 24h. Thermal analysis and X-ray diffraction were used to identify the temperature range of heat-treatment. The average pore size and the pore volume were investigated by a nitrogen adsorption instrument, and SEM was used to characterize the appearance of the porous glass. The results show that the average size of pores changed from 3.75nm to 3.03nm when heat treated at 640–680°C for 6h. In addition, when heat treated at 640°C for 6–24h, the pore size fell from 3.75nm to 3.66nm. The surface area and pore volume become larger with the increase in both temperature and heat treatment time.