The system uses MSP430 micropower single chip microcomputer as controller and data processing chip in order to improve power generation efficiency of solar panel. Sunlight analog quantity measured by sensor is sampled by AD with skillful using of circular array light sensor to determine sunlight position on basis of obtained coding. Therefore, 2 steering engines can seek sunlight in 2 free degrees and make solar cell panel to generate the maximum output generation by pointing at direct sunshine position. Meanwhile, application of adaptive algorithm helps to improve detection accuracy of sunlight position. This essay focuses on discussing hardware realization method and software algorithm for accurate positioning of sun chasing system.