Health risks,ecological risks and trade risks caused by co-existence of genetically modified (GM) crops and non-GM crops have challenged modern genetic engineering technology.Scholars from both home and abroad have made extensive study on legal problems of coexistence of GM crops and non-GM crops.This paper,from the two perspectives of legal system environment and legal system-restriction,uses literature method and comparative method to sort out and analyze the existing study from home and abroad on co-existence of GM crops and non-GM crops.This paper finally puts forward some contributions and problems of the existing study and points out that China should take advantage of legislature practice and its institutional operation from foreign countries so as to construct the co-existing legal system of GM crops and non-GM crops with Chinese characteristics. 