The characterization of alkali activated cement prepared by blending blast furnace slag (BFS) and fine metakaolin (FMK) are studied. MK of particle size 45 μm and blain area 6530 cm2/kg is used as 20%, 40%, 60% and 80% replacement of BFS in the production of alkali activated cement. The alkaline activator used was mixture of NaOH and Na2SiO3 with various molar ratios. The prepared specimens are cured under humid conditions up to 90 days. All specimens are characterized regarding setting times, compressive strength and water absorption. The formed hydrates are studied using XRD analysis, FTIR spectroscopy and SEM. The durability of the prepared geopolymer are determined via studying the fire resistance at 300 o, 600 o and 800 oC and sulfate ions attacks after time intervals extended up to 1 year. The results indicate that the specimens made from 60% BFS and 40% FMK and activated by (1:1) NaOH and Na2SiO3 were revealed the best overall behavior.