Insufficient hardness, i.e. impotence. It cannot be directly equated with kidney yang deficiency. There are many reasons for lack of hardness. One of the common causes is congenital deficiency or sexual excesses and over-indulgence, resulting in kidney essence deficiency and kidney yang deficiency. Kidney yang deficiency is mostly accompanied by mental depression, weakness, drowsiness, fear of cold, dizziness, tinnitus, soreness and coldness below the waist and knees, loss of libido, increased nocturnal urination, timidity and suspiciousness, etc. Clinically, it is important to clarify the cause of impotence, treat the cause, and actively treat the primary diseases that tend to cause impotence (such as diabetes, arteriosclerosis, hyperthyroidism, cortisolism, etc.), so the cause of insufficient hardness needs to be further clarified and cannot be judged as kidney yang deficiency. Clinically, if it is determined that the lack of hardness is due to kidney yang deficiency, the method of warming the kidneys and strengthening yang is mostly used. Drugs such as Baji Tian, Xian Ling Spleen, Shu Di Huang, Cornu Cervi Pantotrichum, Cinnamon, Leek Seed and Cuscuta Seed are commonly used. The Chinese patent medicine is mostly used to use Right Return Pill, Jin Kui Kidney Qi Pill and so on. In life, it is necessary to abstain from sexual desire, reduce sexual intercourse, regulate the emotions, enjoy sex, prevent mental tension, and quit smoking and alcohol. In order to consolidate the treatment, when treating impotence and impotence gets better, sexual life should be suspended for a period of time to avoid recurrence and affect the treatment effect. To sum up, the lack of hardness cannot be judged as kidney yang deficiency, the specific situation needs to be further diagnosed in the hospital, after the doctor identifies the evidence to give a clear cause, symptomatic treatment, not to take drugs blindly on their own, so as not to aggravate the symptoms.