We state the concept, tasks of diagnostics, and then put forward the main development direction of it in this paper.We hope experts and scholars to point out mistakes.We should constantly study the concept and tasks of diagnostics, then adjust and improve the development direction of it.We should try to finish the heavy and arduous tasks of diagnostics and combine the traditional diagnosis technology and methods with the modern closely, then apply them to clinic and serve the patients.We should study the diagnostic thinking, behavior and art constantly and attempt to create teaching methods and evaluation system of diagnostics, which accord with the situation of China.We should strengthen the education and training of clinical basic ability of clinicians.Diagnostics should be developed by the way of subject.