Based on observational data for 87.5 h at a station in July 1984, the structure of wave packet is studied, indicating the discontinuity of tide-generated internal wave travelling in a single direction with four sets of wave packet and three noise ranges in between, whose average direction and velocity are correspondingly -95° and 50 cm/s and whose frequency feature agrees with the spectrum feature of isotherm and variation current of mean current in the lower and upper layers. It is proved from a comparison of models that the physical implications of our two-layer model are completely consistent with those of soliton theory, i.e., both models reflect that, in the propagation direction of the wave, the shear effect of tide-generated internal waves is proportional to its amplitude, but ours is more applicable. Based on observational data for 87.5 h at a station in July 1984, the structure of wave packet is studied, indicating the discontinuity of tide-generated internal wave traveling in a single direction with four sets of wave packet and three noise ranges in between, whose average direction and velocity are correspondingly -95 ° and 50 cm / s and whose frequency feature agrees with the spectrum feature of isotherm and variation current of mean current in the lower and upper layers. It is proven from a comparison of models that the physical implications of our two-layer model are completely consistent with those of soliton theory, ie, both models reflect that, in the propagation direction of the wave, the shear effect of tide-generated internal waves is proportional to its amplitude, but ours is more applicable .