Whether or not to take off your pants for an ultrasound examination of the prostate varies depending on the method of ultrasound examination of the prostate. If you are having your prostate examined by ultrasound through the abdomen, you do not need to take off your pants; if you are having your prostate examined through the rectum, you need to take off your pants. Color ultrasound examination of the prostate if through abdominal ultrasound, you must hold your urine, moderate filling of the bladder, in the case of the bladder to make a transmissive window, you can clearly see the prostate is located behind the bladder, you can observe the size of the prostate, morphology, internal echogenicity, whether the envelope is intact, you can diagnose prostate hyperplasia, prostate cysts, prostate stones, prostate tumors. Through rectal examination of the prostate, the use of the probe is a high frequency probe, which can observe the size, morphology, internal echo of the prostate more clearly, with higher resolution, and is superior for the diagnosis of prostate tumors.