Chengdu Donghua Excellence Technology Co., LTD. (formerly the West China Institute of Geotechnical Instruments, Sichuan University) is a professional company committed to the development, production and sales of large-scale coarse grained soil and rock testing equipment. Products are widely used in geological engineering, water conservancy and hydropower, civil engineering and safety engineering and other fields. The company has won the honorary title of National high-tech enterprise, Sichuan Gazelle Enterprise, double soft certification enterprise, AAAA level credit enterprise, well-known brand, product quality stability qualified enterprise, and obtained the IS09001:2015 quality management system certification, IS014001:2015 environmental management system certification; ISO45001:2015 Occupational Health system certification. Professor Zhang Jixun, the general technical director of the company, has been committed to the research of geotechnical instruments for more than 40 years since he developed and produced the coarse-grained soil triaxial instrument in 1976. The company has obtained more than 30 invention patents and utility models in core technologies such as coarse-grained soil true triaxial, direct shear compression, high-precision and low-speed numerical control metering oil source speed control system, independent dynamic and static hydraulic circuit dynamic and static composite cylinder, filling the technical gaps at home and abroad. The company's core products are: rock and soil mechanics test equipment, Marine mechanics test equipment, ultra-high pressure automatic valve series, high frequency dynamic test system, rock and soil equipment 3D virtual simulation teaching software. In recent years, the company has participated in the National Natural Science Foundation-Gaoba Reservoir operation rock mass hydraulic coupling simulation test equipment project (3000 tons of rock true triaxial), lunar surface environment simulation and lunar soil mechanical characteristics test system project (simulation of lunar surface environment, study of lunar rock and soil), and has made important breakthroughs in the coupling of rock and soil mechanics environment.The rock and soil mechanics experimental equipment independently developed and produced by the company has the ability to set up, support and overall equipment for various scientific research laboratories. It has been widely used in universities and institutes such as Sichuan University, Southwest Jiaotong University, Chongqing University, Central South University, Hubei University of Technology, etc., and has been exported to Southeast Asian countries for many times, such as Chiang Mai University of Thailand and Suranlari University of Technology, and has been praised at home and abroad. It also provides an important guarantee for the university to perfect the discipline construction and improve the scientific research ability. At the same time, the company is also the graduate training base of Central South University, and has continuously exported experienced talents for the geotechnical industry over the years.