Abstract: In the stress-strain course of being controlled,the sound velocity of each type seafloor sediment is variance as the developing of the strain course.The experimontal analysing show three conclusions at last:(1) The maximum sound velocity come out at stress peak value,(2) The maximum sound velocity come out at the phase of not loading,(3) The maximum sound velocity come out at the end of strain course.These results relate to the physical mechanic features and structural characteristics of sediments.