Abstract: With the development of ocean resources exploration and shore engineering construction,we e-ncountered marine geological hazard.In order to avoid the damage,we should investigate ocean hazard geol-ogy and engineering geology.The practical experience in the past 20 years shows that shallow bed geophys-ical exploration techniques such as high resolution seismic investigation,seismic scan sonar,method of sounding,and magnetic observation can help us understand marine geology hazard and shallow bed engineering features economically and quickly.