Abstract: Stellar Abundance and Galactic Evolution (SAGE) photometric system is a self-designed system, which can provide accurate stellar atmosphere parameters and extinction. The actual 100σ depths of the single-epoch images are u_SC~17.3 and v_SAGE~16.8 (AB magnitude). We are performing a SAGE photometric sky survey of the northern sky, covering about 12000 squared degrees and over 500 million stars. This will be valuable data in research of the Milky Way. This paper introduces the research and development of the pipeline for the survey, particularly the data reduction process of a single exposure. The procedures include bias and flat correction, astrometric calibration, photometry and flux calibration. This paper also introduces the main results and data quality produced by the pipeline.