Lung cancer is one of the most common malignant tumors. In China the mortality rate of lung cancer ranks first among malignant tumors seriously endangering the health of Chinese people. Faced with this current situation how to timely and quickly improve the quality of life of patients and extend their lifespan is an urgent problem to be solved. Sarcopenia refers to age -related muscle mass loss accompanied by decreased muscle strength or physical dysfunction. Sarcopenia can be caused by many factors such as chronic diseases lack of exercise malnutrition and drug side effects. At the same time more and more studies have also proved that sarcopenia has a high incidence rate in lung cancer gastric cancer liver cancer esophageal cancer and other types of tumors and it is also an independent risk factor affecting the prognosis of tumors. At present although sarcopenia is common in lung cancer patients the pathophysiology is still unclear. Therefore this article reviews the definition and diagnosis of sarcopenia the pathogenesis of lung cancer-related sarcopenia and the impact of sarcopenia on the prognosis of lung cancer patients with different treatment methods so as to provide a theoretical basis for the prevention of lung cancer related sarcopenia.