The invention provides a silica-alumina-sodium oxide glass easy to melt and suitable for a low temperature ion exchange process. The glass is suitable for chemical tempering and consists of 55-60 wt % of SiO2, 0.1-2.5 wt % of B2O3, 11-16 wt % of Al2O3, 14-17 wt % of Na2O, 1-8 wt % of K2O, 0-8 wt % of ZrO2, 0-5 wt % of CaO, 0-5 wt % of MgO and 0-1 wt % of Sb2O3. By reasonably setting the composition, the difficulty in glass production decreases and the glass melting temperature is reduced obviously, which is favorable to reduce energy consumption and improve yield of products. Under the condition that tempering temperature is 380□-500□ and tempering time is 4-12 h, the surface compressive stress can be 610-1100 Mpa, the depth of a stress layer can be 31-80 μm, and the glass is reinforced and has high shock resistance. The glass of the invention has high wear resistance and can be used as a protective glass material of high-grade electronic display products such as mobile phones and PDAs.