Testicular contraction is mostly due to the contraction of the epididymal reflex, which is a normal physiological manifestation and not a disease condition. The testes are supplied with blood by the spermatic cord, and the fascia of the spermatic cord and the levator muscle exist outside the spermatic cord. When the inner thigh is stimulated, the levator muscle can be induced to contract, which can lead to contraction of the testes. This is a normal superficial reflex of the human body. When a disease is present, the testicular reflex will be tested to determine if there is a neurological disorder in the patient, resulting in the disappearance of the superficial reflex. The principle is equivalent to the knee reflex, for example, when tapping the knee, there is an automatic rebound phenomenon in the leg, which is a normal reflex arc of the body and not a disease condition. If there is an inability to contract the testicles, it suggests that there may be a loss of the levator reflex and that one may have peripheral nerve dysfunction or central nerve dysfunction. Further localization examination is needed, and symptomatic nerve nutrition therapy should be given if necessary.