The Advanced Space-based Solar Observatory (ASO-S) is a mission dedicated to solar physics and is the first Chinese satellite for solar physics study. The ASO-S mission was proposed by Chinese solar community in 2011. The scientific objectives can be summarized as '1M2B'. Here, '1M' stands for magnetic field while '2B' for the two major eruptive phenomena (bursts) on the Sun: solar flares and coronal mass ejections (CMEs).