The level is adjustable, which is convenient for test requirements of different lengths. Adopting our company's self-developed and proprietary multi-channel closed-loop coordinated loading electro-hydraulic servo control system, computer-controlled multi-level hydraulic loading, stable continuous loading, multi-level test force maintenance, automatic continuous and stable loading, automatic load retention, automatic acquisition It also stores data, stores and draws curves, and automatically prints test reports. The computer controls the test process in a timely manner, displays test force and test curves, and is simple and reliable to operate.