According to the RTOGRP grading standard of the National Radiotherapy Collaborative Group, radiation pneumonia is divided into 5-6 grades: grade 0 is as normal as no symptoms, can work and live normally; grade 1 only appears mild cough, does not need medication, symptoms can be relieved on their own, when exertion some patients can appear dyspnea phenomenon. grade 2 if the cough intensifies as a persistent dry cough, need narcotic cough medicine to relieve the symptoms, after the activity of dyspnea is 2. Grade 3 is pneumonia, with a severe cough that is difficult to control with medication and persistent dyspnea, and typical changes of radiation pneumonia on lung imaging, requiring hormone therapy to relieve symptoms. Grade 5 results in death.