The magnitude and distribution of night sky stars in the astronomical station can be used to guide multi-device sky surveys. A monitoring all-sky system is widely employed to monitor local sky areas, and some methods are described in this paper to extract stars' information from all-sky images. Due to the impact of the field of view and high-order distortion of the all-sky images, a combined approach of zenith equidistant projection and polynomial function is applied to astrometry. The root mean square residual of astrometry solution is about 0.15 pixel. By photometry of bright star parts in the image, we can use the differential magnitude values to correct atmospheric extinction errors. Finally, the HEALPix (Hierarchical Equal Area isoLatitude Pixelation) partition represents the sky area of optical surveys and limiting magnitude.