Technology is currently developing rapidly, so every business such as sales needs to implement an information system. UD.Dicky is a business that operates in the field of selling basic necessities in the form of rice, edible oil, sugar and other necessities located at Jl. Captain Muslim No.120, Dwi Kora, Kec. Medan Helvetia, Medan City, North Sumatra 20123. The problem with the ongoing business process at UD.Dicky is that there is no processing and storage of data on sales, purchases and inventory of goods so that errors often occur in recording transactions carried out and also making reports. The methodology used is SDLC (System Development Life Cycle). The results obtained from this research are a sales, purchasing and inventory information system design, if continued to the system development stage it can be used as a basis for developing the proposed system