This study aims to propose a planning model of raw material for seaweed agro-industry in Southeast Sulawesi Province. The analytical methods used are the analysis of raw material and land area requirements, Economic Order Quantity (EOQ) and Reorder Point (ROP) analyses and Exponential Comparison (MPE) analysis. The results showed that seaweed agro-industry in Southeast Sulawesi Province can be developed, because the amount of seaweed produced as agro-industrial raw material for carragenan is higher than the need for agro-industrial raw materials, but it is mainly exported, causing some problems for domestic industries. An Alkali treated cottonii (ATC) production of 14.4 tons per month, or 172.8 tons per year, requires 557424 tons of raw material per year, smaller than the production of seaweed by the Landmark Sulawesi Province, which is 865320 tons per year. Moreover, an economical agro-industrial inventory system is 65693 tons per order, and the reorder point in the procurement of raw materials is when the amount of raw materials in the agro-industrial warehouse amounts to 168.4 tons. The raw material needs for seaweed agro-industry considers continuity and accuracy of supply, followed by quality of raw materials and quantity of raw materials with the model of raw material procurement is the pattern of partnership with farmers as the first priority followed by the pattern of cooperation with cooperatives.