Making reference to the priciple of data classification in“the Common Description Criteria of laboratory animal resources”issued by China, the article classifys laboratory animals according to five kinds of data of biological characteristics including essential information，genetic data，physiological data，biochemical data and anatomical data, aiming at exploring a set of flexible and extendible method of classification and coding of laboratory animal's biological characteristics by using the structure of administrative level, which plays a major role in saving, sharing and managing data resources of laboratory animal.