[en] As to the vacuum system of the SPring-8 storage ring, the vacuum and exhaust equipments are present widely over the whole storage ring with circumferential length of 1436 m, and the machinery and equipment in 48 cells, which are the objects of control, are 2013 m of NEG strip, 241 SIP, 88 DIP, 61 TSP, 48 TMP and 464 BA vacuum gauge. As for the attained pressure, in order to secure the electron beam life of about 20 h, 10^-11 Torr without beam and below 10^-9 Torr in beam operation are required. For the rise up to such ultrahigh vacuum in the vacuum exhaust system, long time is required, therefore, it is important to operate the system stably, without breaking vacuum as far as possible. The basic way of thinking on the control is to avoid concentrated control, and to disperse the control. Namely, the field control board with built-in programmable controller is installed in each cell, and each cell is controlled independently. This method is effective for minimizing the range and time of stop in troubles, and increasing the workability in the construction and maintenance. The information of the field control board in each cell is monitored and indicated at the central control board. The constitution of the whole system and software are reported. (K.I.)