Medicine intermediate, biochemistry research, compound amino acid formula combination, multi- peptides synthesis raw material. By the record, Omithine has the enhancement human body immunity, anti- eliminates wearily, is advantageous to the human body health. Omithine’s physics and chemical property: This for white crystallization powder, odorlessness, load density 0.44-0.52m/cc. The melting point is 245 ℃ (decomposition), does not have the boiling point, have the flash, the ignition point data. Water absorbability, is easy to accommodate to the water, certainly does not accommodate to organic solvent and so on ethyl alcohol, methyl alcohol. This is relatively stable under the acidic condition, meets the alkali decomposes, have no-responds with the water, the pyrolytic decomposition, should avoid to the strong oxidized medium contact. This does not have burning, the detonation, poisons and so on the data reports, the watery solution reveals the acid reaction, should avoid to the eye, the skin direct contact, non- dangerous rank data report.