The gravity collapse in density stratification fluid, as one kind of excitation sources for large amplitude internal solitary waves (ISWs), is studied by constructing the initial step-like rectangular disturbance for a two-layer fluid system in both stratified fluid flume and numerical model respectively. The characteristics of excitation source, the conditions of the stable propagation and the existence of the large-amplitude ISWs are brought insight in detail. The characteristics of the larger-amplitude ISWs tend to be predicted by the eKdV or MCC theories, and the prediction is selective for the different value between the upper and lower layers in a two-layer fluid system.
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