Inventory system menas the input process and output process of such a thing in a warehouse. Inventory information system is a system created to improve and develop the existing system at PT Cipta Sentosa Albahar. Albahar PT Cipta Sentosa which is an agent company that distributes gas cylinders of various kinds and stalls in Bekasi. The research method used is the First In First Out (FIFO). Also by doing a case study that analyzes how is the business processes in the company. Keywords: :First In First Out, FIFO, Inventory.