Yudai Island is located in the lower reaches of the Yangtze River，there is a large lake behind the shore slope，so the problem of post-slope seepage is serious. To ensure the safety of the shore slope，improve the overall stability of the shore slope，and reduce the amount of soil erosion，the shore slope needs to be reasonably protected. Through the physical model，we simulate the seepage of the shore slope under the protective structure of the Terra blok mat and the shore slope of the bare soil section to carry out the comparison test，set several observation points，use MATLAB software to draw the three-dimensional topographic map before and after the seepage，and observe the displacement of the shore slope setting points. The results show that the maximum displacement of the observation point with the protection structure of the Terra blok mat after seepage is 2 cm，and the maximum displacement of the bare soil segment is 5.1 cm. The topographic maps of the Terra blok mat section before and after seepage are consistent，which can illustrate that the Terra blok mat has a good protective effect on post-slope seepage.