The human body is usually composed of nine systems, classified physiologically and anatomically as the motor system, digestive system, respiratory system, urinary system, reproductive system, circulatory system, endocrine system, nervous system, and sensory apparatus, and part of the classification proposes to classify the immune system as one of the nine systems. The human body is mainly made up of cells, which in turn form tissues, which form organs, which build systems, and which make up the human body. Different systems, including the following different organs and different physiological functions. 1, the motor system: with the function of movement, support and protection. It mainly includes bones, joints and skeletal muscles, which account for 60% of the body weight. Bone and joints are linked together to form the skeleton, thus playing a role in forming the human form, supporting weight and protecting internal organs. Skeletal muscles are the power support of the locomotor system, mostly located in the bones, mainly in the limbs and trunk, and are controlled by the body’s consciousness. Common diseases of the locomotor system, including rickets, cervical spondylosis, lumbar disc herniation, osteoporosis, fractures and joint deformities, etc.; 2. Digestive system: mainly composed of digestive ducts and digestive glands, digestive ducts usually refer to the ducts from the mouth to the anus, including the mouth, pharynx, esophagus, stomach, small intestine and large intestine, the morphology and function of each part will be somewhat different. The digestive glands mainly include the liver, pancreas, oral glands, and some small glands within the walls of the digestive duct, such as the labial glands, intestinal glands, and esophageal glands. The digestive system has the function of digesting and absorbing the ingested food through physical and chemical action, and excreting the food residues from the body. Common diseases of the digestive system include peptic ulcers, gastroenteritis, gallstones, cirrhosis of the liver and diarrhea. 3. Respiratory system: It consists of the lungs and the respiratory tract, which is divided into the upper respiratory tract and the lower respiratory tract, usually the upper respiratory tract is divided into the nose, pharynx and larynx, and the lower respiratory tract is the trachea and bronchi. The lung parenchyma and interstitial lung constitute the lung. The lung parenchyma includes alveoli and bronchial tree, and the interstitial lung includes nerves, blood vessels, lymphatic vessels and nodal hoof tissue. The main function of the respiratory system is gas exchange, which also includes participation in the metabolism of certain substances in the body, etc. Common lung diseases, including pneumonia, chronic bronchitis, bronchial asthma, and lung cancer, etc.; 4. Urinary system: including kidney, ureter, bladder and urethra, in the process of body metabolism, excrete excess water as well as metabolism generated waste, and keep the internal environment of the body somewhat stable. The working mode of the urinary system is mainly through the kidneys to produce urine, and then through the ureter to the bladder for storage, after which it is discharged through the urethra. Its common diseases include ureteral stones, bladder stones, acute renal failure, chronic nephritis, etc.; 5. Reproductive system: it has the role of reproducing offspring and forming and maintaining secondary sexual characteristics. The reproductive system is divided into external and internal genitalia, and there are differences between men and women. The male external genitalia include the scrotum and penis, and the internal genitalia include the testes, epididymis, vas deferens, ejaculatory ducts, urethra, seminal vesicles, prostate, and urethral bulbous glands. In women, the external genitalia include the female genitalia and the internal genitalia include the ovaries, fallopian tubes, uterus, vagina, and vestibular gland. Common diseases of the reproductive system, including infertility, dysmenorrhea, epididymitis and prostatitis; 6. Circulatory system: It belongs to the closed pipeline system distributed in various parts of the body, including the cardiovascular system and the lymphatic system. The circulatory system is known as the transport system, mainly through material transport, transporting nutrients and oxygen through the system to all parts of the body, and transporting the metabolic wastes it produces to the skin, kidneys and lungs, and then excreting them out of the body. It also transports heat and hormones, etc., maintains the body’s temperature and regulates the body’s functions accordingly. The main diseases of the circulatory system, including coronary heart disease, hypertension and hyperlipidemia, etc.; 7. Endocrine system: It belongs to the regulatory system of the body and works together with the nervous system to maintain the smoothness of the body’s internal environment, and can regulate the growth and development, reproduction and various metabolic activities of the human body. It mainly includes endocrine glands and endocrine tissues, endocrine glands secrete substances for hormones, endocrine tissues are mainly cell clusters in organs or tissues of the body, such as islets in the pancreas, etc. The main diseases include diabetes, thyroid disease and Cushing’s syndrome, etc.; 8, the nervous system: belongs to the important regulatory system, among the systems of the human body, the structure and function are more complex, the nervous system is divided into the central and peripheral parts. The central nervous system includes the brain and spinal cord, and the peripheral nervous system includes the spinal nerves, cerebral nerves and visceral nerves. The nervous system can regulate and control various systems and organs, and unify to complete the physiological functions, the main diseases include Alzheimer’s disease, ADHD and epilepsy, etc.; 9, sensory apparatus: can feel environmental stimuli and produce certain excitation. Mainly including endoreceptors, exoreceptors and proprioceptors, mainly including the optic apparatus (eye, eye attachments and the blood vessels and nerves of the eye) and the vestibular snail (outer ear, middle ear and inner ear), etc. The main diseases include Ménière’s disease, sensory loss and sensory allergy, etc.