The invention provides a method for adding information in an image file, which comprises the following steps of: opening the image file and positioning the tag end position of the image file; attaching the additional information, described by structured data formal language, of the image file and an additional information header of format information reflecting the additional information to the tag end position. Through the method, the problem of poor using flexibility due to large limit of the format of the image file or environment in the information adding of the image file in the prior art.