For the examination of prostate cancer, the first and very important method is the digital rectal examination, which can also serve as a screening method for prostate cancer. If a prostate lump is detected through digital rectal examination, it is necessary to perform a biopsy via transrectal or perineal puncture, as the puncture biopsy is considered the gold standard for confirming prostate cancer. Clinically, the tumor marker PSA for prostate cancer is also combined, which has great clinical significance as it is the most specific and sensitive tumor marker for prostate cancer. Therefore, prostate cancer can be diagnosed by combining the PSA test with digital rectal examination and puncture biopsy.