Circumstellar disk study with ALMA

"Circumstellar disks, exoplanets and the solar system" is the one of ALMA proposal categories, which is closely related to the one of the fundamental questions in astrophysics, " when, where, and how planets form". I will review the Cycle-0/1 observational results of this topic, which had only 16/32 antennas and the maximum angular resolutions of 0.45/0.16 arcsec at 345GHz at that time. Eventually, ALMA equipped with 66 antennas and 0.01 arcsec angular resolution will allow us to study details of the circumstellar disks with the 1AU resolution at the distance of 100pc.