Abstract: By the joint efforts of the Beijing China Railway Ruiwei Foundation Engineering Co., Ltd., and SOILMEC in Italy with the support of the Ministry of Railways and Lanzhou-Chongqing Railway Company, the experimental study of controlled deformation with core soil reinforcement was applied for the first time in China on the Taoshuping Tunnel on the Lanzhou-Chongqing Railway with great success. This paper gives a detailed introduction to aspects of the project profile, geological conditions, construction technology, construction equipment, and the effects of the application of controlled deformation with core soil reinforcement.