The radio spectrum scarcity represents a major challenge for wireless communication systems, this is a result of allocating radio spectrum statically with exclusive assignment policy. Many studies stated that most of the assigned radio spectrum is underutilized. This tight situation was a motive to turn into Dynamic Spectrum Allocation (DSA) and design systems that could handle DSA efficiently. We designed an integrated Cloud Spectrum Management System (CSMS). In this system we introduce a Cloud Spectrum Broker (CSB) that uses geo-location cloud-based database to monitor and share radio spectrum between Primary Users (PUs) and Secondary Users (SUs). The core of CSMS is the trading engine, which is designed to handle requests from competing SUs in an auction-based algorithm. The architecture and vital building blocks of the Cloud Spectrum Management System (CSMS) are discussed in details in this paper.