This solar photometer is designed to measure not only the spectral characteristics of direct solar radiation, but the angle scatterring property of the atmosphere (i.e. aureole). It is controlled by a microcomputer, so can work with functions of searching and tracking the Sun movement, converting niters, adjusting the gain of amplifier, sampling and storing the data on time. The experiments showed that the results measured are in high accuracy, even can obtain the variation of the atmospheric optical thickness.