The use of hydrotalcite in catalysis has wide attention in academic research and industrial parties. Based on its utilization, hydrotalcite can be active catalyst or support. This research is focused on the investigation of characteristic like spesific surface area of Mg-Al hydrotalcite which is prepared with different temperature of calcination. Synthesis of MgAl hydrotalcites with Mg/Al molar ratio 3:1 were prepared by co-precipitation method. Mg(NO 3 ) 3 .6H 2 O and Al(NO 3 ) 3 .9H 2 O as precursors of Mg-Al hydrotalcite. Na 2 CO 3 was used as precipitant agent and NaOH was used as buffer solution.