SPA is also called "hydrotherapy", that is, using water as the medium, using the contact between people and water, some special ingredients contained in water that are beneficial to human health or bodybuilding enter the human body through affinity infiltration to achieve the purpose of treatment or beauty. SPA is the most common form of spa. According to research, there is a small town "Spa" in Belgium, which was very famous during the Roman Empire. There is a hot spring in the town. Because the spring water is rich in minerals and aromatic essential oils, people often take a bath in the water, which makes them feel particularly comfortable, their skin becomes white and smooth, their figure becomes symmetrical and plump, and many diseases can be eliminated. Washing your face with spring water can eliminate spots, increase skin elasticity and luster, and make skin white and tender. For a time, the town became the "hometown of angels", and many people came here from thousands of miles. For a long time, people have called this SPA environment and method "SPA". In modern times, scientists have discovered the secret of hot springs. The essential oil in the water comes from the soaking of thousands of flowers and plants in the upper layer of the local mountain water source. It is difficult to find a natural spa environment and special water quality in the city now. Therefore, people have simulated and built some spas and related environments, and used some special substances to dissolve in water or act on the human body to stimulate people's senses, nerves and brain, thus achieving the purpose of health care. This is the modern "SPA".