Erection without hardness is categorized as impotence in Traditional Chinese Medicine (TCM), and kidney yin deficiency can lead to impotence. Kidney yin deficiency can also lead to this disease when it accumulates with kidney yang over time. Impotence refers to the impotence of the penis during sexual intercourse, not lifting, not firm, firm but not hard, can not have a normal sex life. Impotence is mostly due to innate endowment insufficiency (inborn poor physique and function), or excessive intercourse, or prolonged illness and other injuries to the kidneys, kidney essence deficiency, kidney yin injury is too much, yin deficiency and fire (deficiency of yin and essence in the body, and the appearance of hyperactive deficiency and fire), fire and heat within the body, injuries to the penis, resulting in penis impotence and weakness and not able to carry out a normal sex life, therefore, renal yin deficiency can lead to impotence. If the kidney yin deficiency is not effectively treated, over time will be involved in the kidney yang, kidney yang deficiency, the penis is not warm, resulting in penile impotence, will also cause impotence. Therefore, the existence of kidney yin deficiency should be early medical treatment, under the guidance of the doctor standardized treatment, so as not to delay the condition.