Recently, it has been attracting attention to the Wireless Sensor Network and Embedded System. The system designers all hoped that constructing the Sensor Grid can achieve the massive information collection and the monitoring effect. However the sensor node which designs in view of the sole function and is effectively unable effectively to move makes other monitor uses, causes each system to appear an enormous difficult problem in the conformity with the repetition use in. But develops one may the expansion, the probability, as well as the low cost sensor node platform solves the key which this question succeeds. This study will discuss how to use the Linux embedded system to create a multi expansions, easy development, and multipurpose goal wireless sensor node. Provide it to establish the large scale sensor grid can reduce the cost.