The average person over 50 years of age, regardless of gender, needs one of the following screening tests: 1) colonoscopy every 10 years; 2) sigmoidoscopy every 5 years; 3) barium colonography every 5 years; 4) CT colonography (virtual colonoscopy) every 5 years; 5) guaiac resin-based fecal occult blood test every year; 6) fecal immunochemical test every year; 7) fecal DNA test every 3 years; it is important to note that It is important to note that except for colonoscopy screening in item 1, all other screening tests should be followed by colonoscopy if abnormalities are found, and the treatment plan should be determined based on the test results. People with high risk of colon cancer need to be screened no matter what age they are, mainly by colonoscopy because colonoscopy has a therapeutic function in addition to examination.