PT. Indonesia Toray Sinthetic is a textile company. In providing inventory to produce products, it is necessary to have a good inventory control and in accordance with production demand. Inventory control in this company often has problems, one of which is excess stock. Material Requirement Planning (MRP) is a method used to control raw material inventories in a company. A company to implement policies in raw material planning must have the right calculation so that there are no excesses and shortcomings in the supply of raw materials. This study used the forecasting method of Linear Trend Analysis, Constant, Exponential Smoothing and Moving Average. The Material Requirement Planning (MRP) methods used are Lot For Lot (LFL), Economic Order Quantity (EOQ), Fixed Order Quantity (FOQ), and Fixed Period Requirement (FPR). The best forecasting result is the Trend Linear Analysis with the smallest error value and the best results from the Material Requirement Planning (MRP) method used is the Economic Order Quantity (EOQ) with a total save cost of Rp 720,000 and the total order cost of Rp 68,552,500 with a total total cost of IDR 69,272,500. So by using the Material Requirement Planning (MRP) method with the Lot Sizing technique in the Economic Order Quantity (EOQ), the company PT. Indonesia Toray Sinthetic can minimize total inventory costs and be more efficient at Rp 81,887,500. - that is, it can be more than 50%.