This study was conducted to determine inventory control performed by PG.Modjopanggoong Tulungagung. And to know the results of the comparison of the company's policy before using Economic order quantity (EOQ) and after using Economic Order Quantiity (EOQ). This study uses a descriptive study. Source of data used is secondary data sources. The data collection is done by way Wawancara / interview and documentation. To analyze the inventory control is done by the PG. Modjopanggoong then need to calculate the cost of booking (Ordering Cost), storage costs (Carrying Cost), and the total cost (total cost), while for calculating inventory control adjuvant by using method Economic Order Quantity (EOQ) need to calculate Kuntitas adjuvant, frequency of purchase ,ordering cost, storage costs, total cost, Safety Stock, Reorder point. The results of this study prove that when companies use a method Economic Order Quantity (EOQ) in 2013, 2014, and 2015 in the purchase of materials, are Saving Total cost of the adjuvant sulfur respectively Rp2.324.004,61, Rp2.124.637, 44, Rp2.629.307,60. Similarly, the phosphate in 2013, 2014 and 2015 there were a total amount of savings in consecutive namely Rp3.735.580,38, Rp3.904.990,02, Rp4.256.985,99.