If rock-throwing spur dike in the service process of the block is lost and the maintenance is not timely，it will lead to the loss of remediation function of spur dike.For the problem that it is difficult to observe the process of underwater block loss in real time，this paper presents the smart block monitoring method.The acceleration and flow velocity data of the block movement in different parts of the spur dike are measured using the flume generalization model test，the test data match the results of manual observation，indicating the reliability of the smart block monitoring method.The experimental results show that the block is subjected to turbulent flow，which generates nonlinear vibration processes.The probability distribution of the block vibration acceleration conforms to the normal distribution and inherits the randomness of turbulent fluctuations.The monitoring method proposed in this paper provides a basis for the selection of maintenance timing for rock-throwing spur dikes，and provides an important reference for the in-depth study of spur dike damage mechanism and sediment initiation.