Diarrhea is common in summer and autumn seasons,both adults and children can be infected with this disease,and summer-heat pathogenic factor and damp pathogenic factor are the main pathogenic factors.The main causes of diarrhea caused by dampness are improper diet or long-term residence in wetlands,which is manifested as chest cavity full tightness,body fatigue,no appetite,diarrhea,tongue coating thick and greasy signs and other stagnated dampness symptoms.There are many records about this kind of diarrhea,while the doctors in the past dynasties rarely discussed the diarrhea due to the invasion of heat pathogenic factor in summer.The cause of summer-heat diarrhea is the attack of summer-heat pathogenic factor.For example,when patients work in hot weather or stay in the stuffy room for a long time,the heat pathogenic factor first attacks the Taiyang(太阳)surface meridian,and then attacks the Yangming(阳明)meridian,and the two Yang(阳)meridians are attacked at the same time,resulting in the Yangming meridian symptoms of fever,sweating,thirst,and heavy pulse,which causes Qi(气)disorder in Yangming meridian.Due to gastrointestinal dysfunction caused by the above reasons,water and grains cannot be metabolized properly,and finally diarrhea occurs.The treatment of summer-heat diarrhea is often confined to the treatment ideas of"Diarrhea is caused by dampness"and"The heat and dampness invade human body simultaneously",which is often confused with dampness-heat diarrhea.Various methods of dispelling dampness can not cure summer-heat diarrhea,but often aggravate the condition,leading to body fluid depletion,and even dizziness.Based on the six meridians theory,this paper expounds the disease from the six aspects of the nature of summer-heat diarrhea,the action mechanism of summer-heat pathogenic factor causing diarrhea,the identification of summer-heat diarrhea and dampness-heat diarrhea,the treatment method of summer-heat diarrhea,medical examples,and the conclusion,in order to provide new ideas and directions for the treatment of this kind of diarrhea.