Bilateral rib diaphragm angle slightly blunt is usually the presence of a small amount of fluid in the pleural cavity manifestation, usually x-ray examination of the imaging results. Patients may be accompanied by dyspnea, chest pain, cough and other symptoms. It is recommended to improve the relevant examination to clarify the cause of the disease. When there is fluid in the costophrenic angle, which is the angle between the diaphragmatic pleura and the costal pleura, the costophrenic angle will be blunted or disappeared when x-ray examination is performed; however, a slightly blunted costophrenic angle bilaterally generally means that the amount of pleural effusion is not too much. Patients with pleural effusion may also have symptoms such as dyspnea, chest pain, and cough. It is recommended that the patient can improve the thoracentesis, ultrasound, bronchoscopy and pleural fluid (fluid that stays in the thoracic cavity) pathologic laboratory. Define the cause of the disease and treat the cause. Patients should pay attention to strict bed rest, eating high nutrition, high energy, high protein food in daily life.