Abstract： The authors illustrated and analyzed the relationship between phlegm- dampness constitution and emesis method of ZHANG Congzheng from various aspects such as phlegm- dampness constitution， the definition of emesis method， the mechanism of adopting emesis method in treating phlegm- dampness constitution， typical cases of ZHANG Congzheng applying emesis method for phlegm-dampness constitution and the modern clinical application of emesis method. The authors believed that the theory “all diseases and syndromes located in the upper body can be treated with emesis method”， which was put forward by ZHANG Congzheng in Confucians' Duties to Their Parents(Rumen Shiqin)， further widened the definition of emesis method， enlarged the application range of emesis method and clarified the clinical significance of emesis method theory. The unique medication characteristics， disposal method and significant therapeutic effect of emesis method in Confucians' Duties to Their Parents have certain enlightening importance for modern clinical treatment of phlegm-dampness constitution.