PT. RACHBINI LEATHER is a company that has production activities in the field of leather tanning and consists of several types of leather including type E.S cowhide and type B cowhide. In carrying out production process activities that depend on process inputs and outputs. Inventory control is an important issue in order to facilitate the production process and minimize costs so that it is efficient in capital turnover. Thus the need for materials with probalistic properties. So in determining the inventory model that is in accordance with the effort to increase the demand for raw materials in the future, a time series analysis approach is used which can determine the probability of a price in the future where the observations are assumed to be dependent on each other which can be the basis for making forecasting models. Where the total number of needs in one year can be used as the basis for determining the pattern of inventory control.