Transnasal bile duct flushing is a clinical treatment for acute obstructive cholangitis and other diseases, mainly through the endotracheal tube for bile duct flushing. Transnasal bile duct flushing can usually be carried out together with transendoscopic nasobiliary drainage. For diseases such as acute obstructive cholangitis, the use of endoscopic treatment is not only effective, but also less traumatic and easy to recover, which can be carried out by placing a catheter into the bile duct through the nose to establish an extracorporeal drainage pathway for bile, and then flushing and anti-inflammation through the injection of physiological saline and antibiotics. Endoscopic treatment is one of the commonly used treatment modalities in clinical practice nowadays, which can shorten the operation time and hospitalization time, and relieve patients’ pain as soon as possible. After the operation, you need to follow the doctor’s prescription diet, mainly fluid and light, high-quality protein, avoid spicy and stimulating food.