In this paper, Propagation measurement system for MIMO relay network was fabricated, and measurement experiment was conducted. Although MIMO relay is known to increase channel capacity and enlarge area coverage of wireless network, there are rarely experiment results to show its superiority. In this paper, measurement system composed of three MIMO tranceivers and mobile positioners was fabricated, by which the channel reponses corresponding to the relative position of the three node (transmit, relay and receive node ) cans be measured. The Initial experiment was conducted in the indoor environment of L-shaped corridor, where shadowing effect on the direct link between the transmitter and receiver is dominant, to validate the performance of MIMO relay system.