The classification of precancerous lesions of prostate cancer is divided into two categories: intraductal carcinoma of the prostate and atypical adenomatous hyperplasia. Among these, the relationship between intraductal carcinoma of the prostate and prostate cancer is the closest. Intraductal carcinoma of the prostate is currently recognized as a precancerous lesion of prostate cancer, while atypical adenomatous hyperplasia has not been proven to be a precancerous lesion of prostate cancer according to current evidence. However, the biological behavior of this atypical adenomatous hyperplasia is not very clear yet, so it should be closely monitored. The histological classification of prostate cancer mainly includes the majority of acinar adenocarcinoma and a small amount of ductal adenocarcinoma, with acinar adenocarcinoma being a highly invasive malignant tumor.