To improve the accuracy of venue type classification at a steel mill, based on detailed survey data, a systematic analysis is conducted by using equivalent shear wave velocity, cover layer thickness, and basic site period indicators. Relying on 654 geological boreholes and 23 sets of shear wave velocity test data, the stratigraphic structure and overburden thickness characteristics are identified; the equivalent shear wave velocity for each hole is tested and calculated based on single-hole method shear wave velocity, and site category identification is completed according to GB 50011—2010. Simplified calculation methods are used to solve the basic site duration, and its correlation with equivalent shear wave velocity and cover layer thickness are analyzed. The research results show that the average thickness of the cover layer in typical areas of the mill is about 20 m, the equivalent shear wave velocity concentrated in 175–265 m/s, all of them are classified as Class II sites according to regulations; The mean basic site duration is 0.34 s (fluctuation range is 0.30–0.48 s), and it is significantly negatively correlated with the two indicators mentioned above. Based on this, the ability of basic site duration to characterize dynamic characteristics is verified, and a three-index comprehensive discrimination method integrating V_se-H-V_s is constructed, providing a reference for seismic design of such industrial sites.