We summarize here the outline of our system. (1) Distributed computer control scheme is adopted. (2) Twenty-five 16-bit mini-computers are connected by 10 Mbps optical fiber cables to form an N-to-N ring network. (3) NODAL interpreter and compiler are used throughout the program development of the system. (4) CAMAC serial highways are used as the means of communication between the mini-computers and the devices. (5) TRISTAN system is controlled from a single control center.