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The anti-seepage wall is an important part of water conservancy and hydropower engineering projects. With the gradual expansion of the scale of the anti-seepage wall, the conventional detection methods for the anti-seepage wall are gradually decreasing. In order to increase the detection methods for the A-Ji anti-seepage wall, the study proposes to use elastic wave CT forward simulation technology, combined with drilling and water injection method, to detect the integrity and permeability of the anti-seepage wall. Elastic wave CT forward simulation technology is a type of tomography detection method that can be used to detect the integrity of anti-seepage walls. The drilling water injection method is divided into constant head water injection method and enclosure well method, which can both detect the permeability of anti-seepage walls. The results show that in low-speed or high-speed abnormal velocity models, the fluctuation of travel time residuals is significant and completely different. The enclosure method is used, and the calculated permeability coefficient is 0.14 * 10-6cm/s at a depth of 15m. The constant head method is used, and the calculated permeability coefficient is 1.88 * 10-6cm/s at a depth of 15m. Based on elastic wave CT forward simulation technology, it can effectively reflect the state of the anti-seepage wall, The permeability coefficient of the anti-seepage wall detected by the enclosure method is lower than that obtained by the constant head water injection method. The method proposed in the study can accurately detect the quality of anti-seepage walls.