In this paper, the process conditions of preparation of L-ornithine by chemical and enzymatic methods were studied. A simple and convenient method of extracting the L-arginase was found. The structure of the object product was characterized by the infrared spectrum and the optical rotation, and the purity of the object product was analysed by the amino acid analyzer. By designing the orthogonal experiment, the factors of the reactions such as the time, the temperature and so on were discussed, and the best ...