Porous anorthite ceramics were fabricated by foam-gelcasting and pressureless sintering method, using α-Al₂O₃,SiO₂ and CaCO₃ as raw materials . By adjusting the foaming agent concentration during foaming process, pore structure could be tailored. XRD was used to analyze phase composition of prepared materials. The microstructure of prepared materials was observed by SEM. Some porperties such as the porosity, bulk density, compressive strength were tested. The influences of foaming agent concentration on the microstructure and properties of materials were studied. The results show that concentration of foaming agent has little effects on the phase composition. While the porosity and pore structure are significantly effected by foaming agent concentration. The compressive strength is obviously influenced too. Through adjusting foaming agent concentration in the range of 0.5 ~ 32 g/L, single phase porous anorthite ceramics with compressive strength of 0.14~3.84 MPa, porosity of 82.14~90.61 % could be fabricated.