Abstract: Geopolymer was prepared with fly ash and metakaolin as the main raw materials, natural zeolite and clay as the auxiliary materials, activated with sodium silicate and quicklime. Influence of curing temperature, curing time and autoclave curing time on compression strength were investigated by orthogonal experiments. Effects of quicklime amount, watersolid ratio and sodium silicate modulus on compression strength were also studied by single factor experiment. Chemical bounding, phase composition and microstructure of geopolymer were characterized by FT-IR, XRD and SEM techniques. Results show that the optimized conditions are curing temperature of 80 ℃, humidity of 95%, curing time of 72 h, autoclaved curing at 0.8 Mpa for 8 h. Quicklime dosage, water solid ratio and the modulus of sodium silicate is 3%（wt）, 0.37 and 2.3, respectively. The compression strength of the optimal sample is 60.8 MPa.