Abstract: In theory, the H-κ scan results obtain the interface information with the largest wave impedance, but during the processing of the actual data, the signal is affected by noise, and adjacent interfaces interfere with the results. If the dominant signals of different interfaces can be distinguished, H-κ scanning processing can be performed separately, and the corresponding interface information can be obtained more accurately. In this study, the classical H-κ scanning method is improved, and the dominant signals of different interfaces can be distinguished by the H-κ scanning in azimuth, and the interface can be determined whether the interface is tilted and the tendency to tilt the interface. Other improved H-κ scanning methods can be used to quantify different interfaces. Through the test of the LSA station (Chinese National Digital Seismic Network) by the H-κ-θ method, it is found that the crustal thickness is about 70km, the average wave ratio of the earth's crust is about 1.67, the dip angle is 24°, the depth of the lower interface is about 115km, the average wave velocity ratio is about 1.66, and the dip angle is 40°.