Based on practical experience and study results, the authors make classification of the nonstructural cracks of tunnel concrete lining. The authors analyze the causes for nonstructural cracks of tunnel concrete lining, taking the raw materials and their mixing ratio, environment and climate conditions, construction techniques and design into full consideration. The countermeasures and case studies of tunnel lining crack control presented in this paper can provide reference for the design and construction of tunnel lining structures in the future.