The diagnosis of prostate hyperplasia can be made through rectal finger diagnosis, ultrasound examination, urological X-ray, CT and magnetic resonance imaging. 1, rectal finger diagnosis: rectal finger diagnosis is a simple and valuable method to diagnose prostate hyperplasia, which must be performed after emptying the bladder of urine. At the same time, the contraction of the rectal sphincter can also be understood. The normal size of the prostate is about 4cm in transverse diameter, 3cm in longitudinal diameter and 2cm in anterior and posterior diameter. when the prostate is enlarged, rectal palpation can reveal an enlarged gland in transverse or longitudinal diameter, or both, and the surface is smooth, the texture is medium hard, elastic globular body, the edge is clear and the central groove is shallow or disappears. The size of the prostate enlargement can be estimated according to rectal palpation. The size of the prostate can be divided into four degrees, from degree I to degree IV, and the volume and weight of the prostate increases in that order. It is also possible to identify the combination of prostate cancer and prostate stones based on the strength of the reflected wave echo and the presence or absence of acoustic shadows. 3.Urological X-ray: If the following urinary tract obstruction involves renal function, or if the enlarged prostate is not obvious on rectal examination, excretory urography or cystography is feasible. 4, CT and magnetic resonance imaging: can show the size and shape of the prostate, whether the texture is uniform, whether it protrudes into the bladder, etc. In some patients, if prostate cancer is suspected, it can be used as one of the differential diagnosis methods. There are more ways to check for prostate enlargement, but rectal palpation is the most basic method.