The thick fat under the skin of the human body is generally known as subcutaneous fat, belongs to the connective tissue, subcutaneous fat is located between the dermis and the muscle, can be assessed through the thickness of subcutaneous fat for certain nutritional status. Human body fat is divided into two kinds of one is subcutaneous fat, the other is the fat wrapped around the organs, most of the fat are present in the subcutaneous tissue, about two-thirds, subcutaneous fat can play a role in insulation, support the role of the skin, for the organs wrapped around the fat can achieve a certain cushioning effect, to play a certain role in protection, and the human body’s thickness of subcutaneous fat can be measured to the body’s overall situation for an assessment, subcutaneous fat is also located in the subcutaneous fat is also a connective tissue. The thickness of subcutaneous fat can be measured to assess the overall condition of the body, and there are also blood vessels, lymphatic vessels and other tissues and organs within the subcutaneous fat. Subcutaneous fat for the human body has a very important role, but not too thick, excessive obesity will affect the normal life and physical health, so we need to maintain a good habit of living and eating habits.