Tracking mobile target in wireless sensors network targets involves finding out the location of mobile targets based on wireless sensor nodes with known positions. Target tracking deals with finding spatial coordinates of a moving object and being able to track its movements. One example is the application for positioning a mobile target based on received signal strength (RSSI) from a set of radio nodes placed at known locations. In this report, we are focusing on tracking mobile target application using fixed known sensors position. The main problem is to estimate the distances of the mobile target from the sensor nodes based on received signal strength (RSSI) and according to that the location will be estimated using the bounding box algorithm (Min-Max).