To solve the access problems of electronic signature on drawings and archived information of electronic file on the integration platform of railway survey and design, an information extration technique from signature table of drawings was proposed. With the styles and structure characteristics of the signature forms in the engineering drawings analyzed, it found the field in the signature table of drawings by feature recognition. Then informations of different styles engineering drawings were extracted and recognized automatically by template match of key words, which facilitates the electronic signature on drawings and archived information of electronic file. Its practical engineering application virified the effectiveness of this method.