[On historical stages of studies on the science of Shang Han Lun].

Based on the inherent rule and historical characteristics, the history of studies on Shang Han Lun can be divided into 5 stages, viz. (1) Formation (Pre-Qin period - 219 AD); (2) Copying (219 - 1065); (3) Stressing clinical application (1065 - 1144); (4) Stressing both theory and practice (1140 - 1894); (5) Comprehensive study (1894 -). Brief descriptions are given to each stage.