According to the increasing importance of UAVs in lots of industries, in this thesis we describe the design and implementation procedure of a Quadrotor as a sample of these UAVs that have the ability of flight and mobile targets autonomous tracking. This thesis is the result of two and a half year persistence of this team and although in a summery, the results of the experiments and experiences will be discussed. In this procedure the electronic hardware and software of robot will be studied at first and then robot control and measuring system will be presented and discussed, then we begin the main subject by studing the embedded systems, machine vision and image processing. In the final we pursue the tracking mobile targets by Quadrotor in details.