Companies need efficiency to survive their lifecycle, and one of the solutions to achieve efficiency is using Just In Time (JIT) method. Just in time method is a philosophy centered on the reduction of costs through elimination of inventory. In this research, there are three main objectives to be achieved; first, to identify how a company (PT LTI) manages the inventory, second produced the quality product, and third efficiency. The research shows that PT LTI while using the JIT method evidently shows good performance in its production and preparation of its management inventory.