Abstract: True triaxial apparatus (TTA) is widely used in theoretical research and engineering application. When dealing with long-term mechanical properties of clay, engineers should conduct time-cost consolidated drained tests. In this situation, automatic apparatus is necessary to improve the reliability of the tests and reduce the burden of the operator. The components of the TTA, the loading devices, the automatic control system, the measurement system and the control program are introduced. The test procedure is given. Finally, the tests on elastic dummy blocks and remolded clay to verify the apparatus are described.