Abstract: South Sulawesi has the largest contribution to seaweed export in Indonesia which also makes the province becomes the leading producer of seaweed in Indonesia that produces 1.517.690 tons/year consists of 1,087,678 tons/year Eucheuma cottonii and 430.012 tons/year Gracillaria sp. Eucheuma cottonii from South Sulawesi was the type of seaweed used in this research. The result of dry sea weed characterization is 20% water and 9.92 % impurity. The optimization process was conducted with two different variables which are KOH soaking time and KOH concentration. To attain optimal production process, it is necessary to perform result test which includes ATC chips yield, viscosity and gel strength at soaking time of 30, 60, 120 and 180 min and also at various concentration of KOH. ATC chips are the raw material of carragenan industry. The viscosity of ATC chips arises with longer soaking time and higher concentration of KOH. The concentration of KOH was gradually added from 0.1-0.5 N which results in not only higher viscosity but also improved gel strength. Yield of 0.2157 was obtained from ATC chips at 180 min soaking time and 0.5 N KOH. The acquired specification of ATC chips are suitable to those commercial Carrageenan of food grade and cosmetics type. At FTIR spectro test, all types of ATC chips show strong wavelength absorbance of 1210-1260 cm^–1 (S = O from Sulfate esters) and 1010-1080 cm^–1 (glycosidic linkage). The other chemical bond indicated as the Carrageenan compiler are 3,-6-anhydro-D-galactose at 928-933 cm^–1, D-galactose-4-sulfate at 840-850 cm^–1 and 3,6-anhydro-D-galactose-2-sulfate at 800-805 cm^–1. Kappa Carrageenan demonstrates FTIR spectrum at 840-850 cm^–1 which then confirms that the type of Carrageenan obtained from this research is Kappa.