Abstract：A laboratory model for studying dynamic behaviour of soil nailed slope under cyclic load is designed. The sinusoidal cyclic load is produced by a multi-channel load system with four kinds of load magnitude，which are 10–30，30–50，40–60，40–80 kN，and the frequency is 2 Hz. Considering boundary condition influence and accumulative effect of cyclic numbers，axial force of soil nails，displacement and acceleration of the panel，and settlement of top surface，are studied in detail. When the load is 10–30 kN，test results with fixed bilateral boundaries are compared with free ones. Axial force of soil nails and displacement of the panel in the former case are less than that in the latter one under the same cyclic numbers. Then comparative experiments with 4 kinds of load magnitudes with free lateral boundaries are studied. With a certain load magnitude， with increase of cyclic numbers，acceleration and displacement of the panel increases slowly，whereas settlement of top surface increases distinguishedly. With the same cyclic numbers，with increase of average load magnitude，acceleration of panel doesnt vary obviously，nevertheless axial force of soil nails，displacement of the panel and settlement of top surface increase significantly，and displacement along slope height is parabolic curve like.
