PT Agung Teknik Rental is a company engaged in heavy equipment rental services. In carrying out its business activities, PT Agung Teknik Rental experienced several problems due to the absence of a system that integrates the purchasing system with fixed assets in the company. The purchase and fixed asset system is a useful system to assist management in making decisions regarding the purchase and management of fixed assets. The method used to develop the system is the Rapid Application Development (RAD) method. The modelling system language used is the Unified Modelling Language (UML). This system was built using the Visual Basic.Net programming language. The results obtained from the system built are purchase reports, fixed asset reports, debt cards, and spare parts inventory cards. The system that has been built is able to assist in recording and producing several reports that are needed by management so that they can integrate information between sections.