Disease

syndrome and symptom are stratified reflections of human diseases in Chinese medicine theoretical system

which is indispensable to diagnosis of disease and syndrome. The diagnosis thinking model of trinity of disease

syndrome and symptom（ including modern medicine examination） gradually gives full play to the advantages of Chinese medicine in the diagnosis and treatment of diseases. From the connotation to the extension

the authors clarify the concepts of disease

syndrome and symptom

emphasize taking the disease-syndrome combination theory as the basis

taking syndrome differentiation as the core

taking objective attitude on "symptom"

"identifying symptom"comprehensively

as well as establish the diagnosis-treatment model of trinity of diagnosing disease

differentiating syndrome and identifying symptom. The authors demonstrate the effect and significance of the model in clinical practice.