The effect of C(3)A content on sulfate resistance of limestone incorporated cements has been investigated within the scope of this study. Cements with two different C(3)A contents (4.6%, 11.2%) have been used. Blended cements have been prepared by separate grinding and mixing method. Limestone incorporation ratios were 5%, 10%, 20% and 40%, respectively. Standard mortar samples of 50 x 50 x 50 mm cubes and 25 x 25 x 285 mm prisms have been prepared. After 1 months of water curing, samples have been exposed to different sulfate solutions (Na2SO4 and MgSO4) and temperatures (5 and 20 degrees C) for a period of 6 months. During this period length changes were monitored and compressive strength values have been determined at 3 and 6 months intervals of sulfate exposure. Furthermore microstructure investigations have been conducted on selected samples.