Eucommia refers to the skin of Eucommia, that is, the skin of the surface of the Eucommia tree, the thicker the skin closer to the root, the better the role will be, the role of Eucommia bark is as follows: 1, treatment of lumbar pain, especially lumbar pain caused by kidney deficiency, including lumbar disc protrusion, lumbar muscle strain, chronic lumbar pain with Eucommia effect is better, and Eucommia bi-warm has the role of dispelling dampness, lumbar including kidney cold dampness with Eucommia also has a certain role; 2, the role of lowering blood pressure, kidney deficiency without fire evidence, heat evidence of hypertension patients, the use of Eucommia bark has a certain therapeutic effect.