The incidence of pancreatic cancer is increasing year by year in recent years. It is clinically identified by several examination means, including laboratory examination, ultrasound, CT scan, magnetic resonance imaging, endoscopic retrograde cholangiopancreatography, gastrointestinal barium meal examination and cytological examination. 1.Laboratory examination: If the pancreatic tumor is located in the head of the pancreas and presses the bile duct causing obstruction, the serum bilirubin will increase significantly. Gastrointestinal cancer-associated antigen CA19-9 is considered to be one of the important indicators for the diagnosis of pancreatic cancer. 2.B ultrasound: Ultrasound images of pancreatic cancer can appear as hypoechoic masses or tumors, and also ultrasound can detect clues of early pancreatic cancer. 3.CT scan: The exact location and size of pancreatic cancer, as well as the presence of lymph node metastasis and vascular invasion can be obviously observed. At present, CT scan is one of the main methods used to diagnose pancreatic cancer. 4.Magnetic resonance imaging: Magnetic resonance imaging is another important way to predict pancreatic cancer before surgery, and has its own advantages compared with CT. 5.Endoscopic retrograde cholangiopancreatography: This method can show the pancreatic duct, bile duct and jugular abdomen at the same time, which is important for the diagnosis of obstructive lesions of the lower bile duct that are difficult to be diagnosed, and pathological biopsy can also be done. 6.Gastrointestinal barium meal examination: this method has limited diagnostic value for pancreatic cancer. 7.Cytological examination: during the endoscopic retrograde cholangiopancreatography, cytological brushing can be performed at the same time to improve the diagnostic accuracy of pancreatic cancer, but the positive rate is not high; or through tissue puncture to take part of the tissue for pathological diagnosis, but the latter has the possibility of causing complications such as bleeding and acute pancreatitis. All of the above methods are able to detect pancreatic cancer.