Recently, Grid computing infrastructures have been developed, but most of them connect nodes with hardwired links. Seldom adopt wireless technology and mobile devices. However, if we can integrate a Grid system with wireless network devices, techniques and resources to form a wireless Grid infrastructure to provide different kinds of terminal devices, Grid applications will soon be popularly and widely deployed in different domains to serve many more people in the world. In this article, we propose a service platform, named Wireless Grid-based mobile agent system (WGMAS) which integrates mobile agent techniques and wireless environment with a Grid system, to provide a wireless accessible mobile agent system to users.