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In this paper, we propose a gateway system for wireless sensor network based on environmental monitoring. Resource sharing and long-distance accessing are important issues for application of wireless sensor network and environmental monitoring. Itpsilas necessary to connect wireless sensor network to external network which makes the administrator could access data duly and expediently from long-distance. Especially users can avoid the awful situation when the environment is terrible. A gateway which is high performance, high reliability, low-power and expandable is designed to connect WSN with external network. Gateway accepts data collected by wireless sensor network and then stores the data in an embedded database SQLite3. And users can manage the data via a website from long-distance or applications in console terminal.