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The wireless sensor networks (WSN) is one of the most significant technologies in the 21st century. In recent years, achievements in micro-sensor technology and low-power electronics make WSN become realities in applications. In this paper, we propose a system for WSN based on environmental monitoring. The system can monitor several environmental parameters such as underground water level, barometric pressure, ambient temperature, atmospheric humidity, wind direction, wind speed and rainfall and provide various convenient services for end users who can manage the data via a website from long-distance or applications in console terminal. This paper introduces the architecture of WSN system, the hardware of node, data acquisition, data processing with gateway and data visualization. Through the use of WSN in the environmental monitoring, it is possible to change the traditionally environmental monitoring methods for people.