The commissioning results obtained from the first beamline of the Siam Photon Source are reported. The beamline is a VUV beamline in which light is monochromatized over the energy range between 20–240 eV. The wavelength calibration was carried out by photoemission measurements using the Fermi edge of gold as the standard. The optical beamline and the experimental station have been tested while the Siam Photon Source was still in the commissioning period. This gave rise to undesirable problems: the large electron beam size, the beam instability and the following intensity fluctuation. Such problem has been overcome up to the present. The photoemission measurements are being carried out on Ni(111).

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