With the rapid growth of text database applications, the research of text access methods has become one of the most interesting topics in database area. According to the characters of Chinese office environment, this paper proposes a new text data base retrieval method which organizes the word signature file in the light of their superimposed coding signature. The method has no false drop that is unavoidable in other signature file methods. So it does not need to scan the full text obtained by searching the signature index .When aqiery is processed,only range scan to the signature file is required.Therefore,within a rather wide scope,the performance of our method is approximate to the inversion which is the fastest one among all the text access methods.In the meantime,it also maintains the merit of fitting dynamic information retrieval environment,that can not be found in other kinds of text access method.