Abstract: The seabed environment near the coast is difficult to detect because of its complexity. In order to detect accurately the rock rip-raps, the artificial reefs, the seawater aquaculture areas and the latent positions of seabed shallow stratum faults in the coastal area, side-scan sonar technology, shallow stratum profiling technology and single-channel seismic technology are used for detecting the seabed environment in the Laizhou Bay, during which the detection parameters are optimized, the interference factors are analyzed and the detection results are summarized. The research results of the three technologies in Laizhou Bay project detection show that: the side-scan sonar technology has extremely high resolution and signal-to-noise ratio in detecting seabed topography and obstacles with water depth of about 12 m and a unilateral scanning width of 75 m in the target area; the shallow stratum profiling technology has high sensitivity to detect the shallow geological information of the seabed when the underwater unit emission frequency is 10 000 Hz and the diving depth is 1.5 m; the single-channel seismic technology has a good effect on detecting relatively deep and complex seabed strata when the excitation energy is 900 J and the excitation frequency is 100 Hz. These three technologies can flexibly, effectively and accurately detect the seafloor stratigraphy and geomorphology and can also provide a direct and effective basis for the development of a green ocean.