Objective To establish the infrared spectrum fingerprint in the absorbing region of 4 000- 400 cm- 1 and its first derivative infrared spectrum fingerprints of Ginkgo tablets(GT), and set up theories of digitized and quantified evaluation for super information characteristics by IRFPs of traditional Chinese medicine(TCM) which consists of the IRFP index, information index, fluctuation index, information fluctuation index and the infrared spectrum fingerprint quantified method. Methods Direct tabletting meth...