In view of the current engineering situation in which the CPTU data of hard soil are difficult to acquired in offshore investigation area,based on the first large-scale application of large penetration force CPTU equipment,comparative analysis is conducted with popular CPTU interpretation correlations for the physical and mechanical properties of Sanya offshore hard soil among seabed CPTU results,lab test result and SPT results.Comparative analysis shows that the internal friction angle of sand and the undrained shear strength of clay from CPTU test are slightly higher than that from lab soil test and SPT.The study on the hard soil with large penetration force CPTU provides useful experience and reference for the similar engineering.