Liver qi offending the lung is a disease caused by liver qi stagnation, fire offending the lung, and loss of lung circulation and purification. Early detection and diagnosis is essential for the disease. Patients also need to identify with some similar symptoms in the diagnosis and treat the symptoms, only then can they recover their health as soon as possible. The differentiation between liver qi offending the lung and other diseases is as follows: 1. Liver qi offending the lung and spleen qi deficiency: both are seen with signs of qi deficiency such as weakness, light tongue and weak pulse. In addition to the above symptoms, spleen qi deficiency is often accompanied by evidence of spleen deficiency such as dullness, vomiting, diarrhea, abdominal distension, and bloating after eating. If the spleen does not control the blood, vomiting blood and black stools may be seen, and the body is mostly thin. Patients with liver qi offending the lung often see symptoms of inability to stretch the mind and tendons, such as anxiousness, indifference, indecision, and sleepy legs. Although fullness of the abdomen and stomach can be seen because the wood is not sparse, this fullness is all false fullness and is soft when pressed, and vomiting and diarrhea are rarely seen. 2, liver qi offending the lung and liver depression: although both have depression symptoms such as anxiousness, chest and rib pain, less abdominal distension, but liver qi offending the lung evidence is labor is depressed, not for the mood of the transfer. However, in the case of liver qi offending the lung, the symptoms of depression are not diverted by the emotions. In the case of hepatic depression, the condition often changes with emotional factors, and appropriate exercise often makes the symptoms better, and the pulse is mostly string. In addition, there are obvious symptoms of Qi deficiency in liver qi offending the lung, which are not present in liver depression. 3, liver qi offending the lung and liver blood deficiency: both see numbness in the limbs, claw nails, vision loss, menstrual diffusion and other evidence. Qi is the basic material manifestation of human life activities. Physiologically, the normal function of the five organs depends on the Qi of the five organs, pathologically, the dysfunction of the internal organs can also cause the malfunction of the Qi of the organs. Liver qi offending the lungs is one of the abnormalities of liver qi, which is a major pathological mechanism of liver dysfunction. If we deny or ignore liver qi offending the lungs, the theory of identification of internal organs is imperfect. All five organs have Qi deficiency, but not the liver, which is a limitation in understanding and thinking. The neglect of liver qi offending the lung directly leads to the gap in clinical diagnosis of liver qi offending the lung.