The four diagnostic methods of Chinese medicine were proposed by Bian Ji on the basis of the experience of his predecessors, namely: looking, smelling, asking and cutting. These four diagnostic methods are still commonly used today and are an important basis for diagnosis and treatment in TCM. The so-called “diagnosis by looking” is to observe the changes of the patient’s spirit, color, shape and posture. The “spirit” is the state of spirit and qi; the “color” is the manifestation of the external glory and color of the five organs and blood; the “shape” is the sign of the abundance and weakness of the body; and the ” state” is the dynamic expression of flexibility and dullness. This is the observation of the patient’s face, mouth, nose, teeth, tongue and moss, limbs, skin, in order to understand the patient’s “God”. In modern times, it is more about looking at the tongue. The so-called “smell diagnosis” refers to listening to the sound of the patient’s voice, breathing, coughing, vomiting, eructation, belching, etc., and also to smell the patient’s body odor, bad breath, phlegm, urine and stool odor by nose. The so-called “consultation” is to ask the patient about the onset and transformation of the disease, such as fever and chills, sweat, head and body sensations, urine and stool, diet and other conditions. The so-called “cut diagnosis” is pulse diagnosis and palpation. Pulse diagnosis is to cut the pulse and to grasp the pulse. Tactile diagnosis is to touch the diseased part of the patient’s body surface with the hand to check the patient’s body temperature, hardness and softness, and refusal to press or like to press, etc. to help diagnose. In the consultation on the Internet, the information of the four diagnoses is incomplete, but except for the pulse cutting, which cannot be done, the other three diagnoses can try to make up for it. For example, the tongue image can be transmitted through photos. The contents of the smelling and questioning can be done through a detailed description of oneself. In the process of description, it is important to be as thorough as possible and at the same time to prioritize. This will help the doctor to make an accurate judgment.