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This paper presents a novel flow control method using PI controller for motion control system over network. UDP/IP protocol is known to be effective for motion control systems over network such as bilateral control system. However, UDP does not have a mechanism of congestion avoidance. The congestion, which causes large communication delay, jitter and packet loss, significantly deteriorates performance and stability of motion control systems. To avoid this congestion, a novel congestion control method, which adjusts a packet-sending period in real time, is proposed. The validity of the proposed method is shown by simulation and experimental results.