Abstract: Sound velocity is a fundamental physical quantity and one of the important parameters in the study of seafloor geoacoustics. It is of great significance and practical value for studying the sound velocity distribution and the correlation between the sound velocity and the geotechnical mechanical parameters of the sediments. Based on the high-resolution sub-bottom profile data and the borehole sampling test data obtained in the Jinzhou Bay of the Bohai Sea, the sound velocity data and the corresponding physical and mechanical property parameter datasets of the micro-sequences in the Holocene sediments are obtained by inversion calculations. Thus, the sound velocity characteristics of the sediments and the correlations between the sound velocity and the physical and mechanical property parameters of the sediments are studied. The results show that the average sound velocity in the Holocene sediments in the Jinzhou Bay ranges from 1.505 to 1.734 km/s, with the mean value being 1.601 km/s. The average sound velocity values in five types of sediments such as silt sand, silt, mud, muddy clay and muddy silty clay are 1.734, 1.645, 1.511, 1.588 and 1.567 km/s, respectively. This variation trend roughly reflects that sound velocity in the sediments decreases with the decrease in particle size and sand content. There is a significant positive linear correlation between the sound velocity and the wet density, dry density and compression modulus of the sediments and a significant negative linear correlation with the void ratio, water content, liquid limit, plastic index and compression coefficient. However, the correlation between the sound velocity and the plastic limit of the sediments is poor and there is no correlation with the liquid index.