The effects of walnut kernel are tonifying the kidney, warming the lungs and moistening the intestines; it is used for kidney yang insufficiency (lack of yang energy in the kidneys), lumbar and knee soreness (a feeling of soreness and weakness in the lumbar and knee areas), impotence and spermatorrhea, coldness and wheezing and coughing, and intestinal dryness and constipation. Walnut kernel is sweet in flavor, warm in nature, belonging to the kidney, lung, large intestine meridian, can be decocted, can also be chewed as a single medicine, can also be used externally by grinding. The effects are tonifying the kidney, warming the lungs and moistening the intestines. The sweet taste can be complementary, has the effect of tonifying the kidney, can be used for kidney yang insufficiency caused by lumbar and knee soreness, impotence, spermatorrhea, enuresis, and so on. Walnut kernel is warm, belongs to the lung meridian, has the effect of warming the lungs, can be used for cold coughing, has the effect of laxative, can be used for intestinal constipation. However, it should be noted that phlegm and fire accumulation of heat, yin deficiency and fire (Yin essence deficiency in the body, the emergence of hyperactive fire) and loose stools should be used with caution. If necessary, the use of medication to consult a traditional Chinese medicine practitioner to identify the evidence to guide, follow the doctor’s instructions to use medication, do not recommend self medication.