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In recent years, with advance in wireless communication technology, sensing technology, micro-electronics technology and embedded system, wireless sensor network (WSN) can be used for various application areas, such as home health care, military and industry. The localization service which provides the location information of mobile user is one of important service provided by WSN, because many applications need to locate the source of incoming measurements. The current localization algorithm in WSN can be divided into two categories: range-based and range-free schemes. Most of the range-based localization method proposed use of the received signal strength indication (RSSI) to make an estimation of the distance between transmitter and receiver. The localization algorithm used the values of RSSI received from the cluster included the mobile node to minimize frequency of the diffraction, reflection, and attenuation. Closer nodes to the router from mobile node are given more weight and location of the node is determined the center of gravity of router nodes. Our localization algorithm used the values of RSSI received from the cluster included the mobile node and used weighted centroid method in which closer nodes to the router from mobile node are given more weight and location of the node is determined the center of gravity of router nodes. CC2420 RF module and ATmega128L MCU are used to be the hardware platform of nodes on the location experiment is designed and implemented in this paper.