The operation of the Synchrotron Radiation Research Center 1.3 GeV synchrotron light source vacuum system shows good features of quick beam self-cleaning, low carbonaceous gas desorption, and less dust. The phenomenon of the photon induced desorption (PID) has been studied. Recently, a set of new vacuum chambers for wiggler were installed, and the commissioning of the storage ring was restarted. The pressure rise and the PID coefficients during the beam running both in the straight and bending chambers were compared. The performance of the overall vacuum system is to be described.