Abstract: To study the mechanical and acoustic properties of natural gas hydrate-bearing sediments,the pipelines of high-pressure and temperature-controlled triaxial apparatus are replanned,and GCTs ultrasonic test system is introduced. To verify the reliability of the apparatus,specimens with various hydrate saturations were prepared with Fujian sand and CH4gas,and drainage triaxial tests were performed under different effective confining pressures. The results show that hydrate-bearing specimens can be prepared and tested stably,and the compression and shear wave velocity can be measured in real time during tests. The change of wave velocity is related to the change of compactness and particle distribution inside the specimen,and can reflect volume change anddilatancy characteristics.Poisson’s ratios of specimens were calculated by the wave velocities after consolidation,which were about 0.16-0.31.