The heating mechanism of the solar corona is one of the fundamental problems in astrophysics. It is generally agreed that the heating is due to the magnetic fields in the solar atmosphere. The Solar-B satellite, the successor of Yohkoh (Solar-A), will be launched in 2006 September. The mission will focus on high resolution optical imaging with magnetography, coupled with X-ray imaging and XUV spectroscopy. Through coordinated observations of the solar atmosphere from the photosphere to the corona, it is expected that Solar-B will bring a major breakthrough to the study of coronal heating mechanism.<br />