Ultrasound, CT, MRI, ERCP (Endoscopic Retrograde Cholangiopancreatography), PTCD (Percutaneous Transhepatic Cholangio Drainage), angiography, laparoscopy, tumor markers measurement, cancer gene analysis, etc., are significantly helpful in confirming the diagnosis of pancreatic cancer and determining whether it is resectable surgically. Generally, ultrasound, CA199, and CEA can be used as screening tests. Once pancreatic cancer is suspected, a CT scan is necessary. If the patient has jaundice, especially severe, and a CT scan cannot confirm the diagnosis, ERCP and PTCD can be considered. If internal drainage is successful, surgery can be delayed for one to two weeks for patients with severe jaundice. The diagnostic value of MRI for pancreatic cancer is not superior to CT. If pancreatic cancer has been confirmed but it is uncertain whether it can be surgically removed, choosing angiography and laparoscopy is also clinically meaningful.