Abstract: By analyzing the traditional wood identification methods,the thesis applies the semantic principle to study the characteristics of the wood identification.With the division and composition of the object’s attributes,the attributes domains are divided into four types as noun type,degree type,number type and describing type,and are handled systematically,digitally and pictorially.The method uses the grey to express the probability of getting values and judgement.The thesis sets up the wood identification Semantic Data Model(SDM) to improve the identifying ability.The method based on SDM is rapid and exact,and can identify woods intangibly.The method is innovated in the wood identification applying information management in Chinese.