Sani Computer is a shop that provides the needs of computer and laptop spare parts located in the city of Pekanbaru. So far, the problem of monitoring the amount of stock is not taken into account in carrying out stock order transactions, this has led to wrong predictions on the total capacity in the warehouse, namely excess or shortage of stock, so it is often a problem related to this stock information. Stock availability information has an impact on the buying and selling process carried out in the store. To overcome the existing problems, a "Inventory Monitoring System for Parts Stock Using the Reorder Point Method at Sani Computer was built". The Reorder Point (ROP) method is a time when the company must place an order again before the existing stock in the warehouse runs out. In using the reorder point method, Sani Computer requires maximum sales value, average sales, lead time, and safety stock. And for testing using Blackbox, to state that all user needs have been met as a whole. This is done so that store managers can use this system easily, for quality systems usually provide more accurate information.