Exhausting of effective energies and materials all results in entropy, and the more the exhausting is, the more the values of entropy gradully tend to. Evidence- based medicine (EBM),as a clinical new concept, can really guide clinical practices from solving problems to finding problems and finally overcoming problems. With EBM, we can put the medical and health resources to more scientific and rational use. It saves up effective energies, prevents exhausting of materials and reduces the values of entropy.