Abstract: Because of the technical complexity of excitation and reception and difficulty in wave recognition especially the limitation of exploring depth (70-100 m) in seismic transverse wave reflection method for shallow-layer projects, the transverse wave method was rarely used. However, based on practical experience for years, the seismic transverse wave reflection method was found able to interpret practically and effectively such catastrophic geological structures as underground water-bearing caves with high precision, of which the exploring depth for seismic focus by hammering can be up to 200-300 m in general, thus providing evidently their formation and features. Through digging and drilling for many times, the exploring method was proved reliable and provide relevant information for urban disaster investigation and evaluation of gob areas and construction sites.