Technological developments are supported by the development of software and hardware is more advanced will be of much help in facilitating data processing sales and purchases of goods and inventories. Inventory system on a CV Evee Store is still manual and not well integrated. This causes frequent data redundancy so that data into inventory can not be controlled properly. Search inventory data is still very long because of the absence of coding on each item. Making the report still manual so it takes a long time. This study has the main goal to be the establishment of information systems can help CV Evee Store in the processing of inventory data sourced from purchases and sales. The method used is the waterfall with using normalization and ERD to define the database and also relationships. In making the application using Visual Basic programming language. Net and use SQL Server as the database. It is expected with this system results can be better and faster data processing in order to maximize the performance of staff in data processing inventory system. Keywords: information systems, inventory, purchasing, sales, SDLC.