The concept of safety without side effects has always been advocated and pursued by the plastic surgery industry. Nowadays, there is a way called green filler called autologous fat filler which is very popular and more and more successful cases have given confidence to beauty lovers. The range of fillers is very wide, from the local tissue of the face, such as the forehead, temples, apple muscle, decree lines to rhinoplasty, chin augmentation and even breast augmentation, etc. The fat can also be taken from the abdomen, iliac waist, thighs and other places according to the needs of the candidates and their own situation, which is minimally invasive, non-rejection, significant effect, and also has the role of liposuction, so it can be said to be a multi-benefit, with many advantages. So is autologous fat filling safe? To know whether a treatment is safe or not, we must first understand its principle. Autologous fat filler is simply an autologous fat transplantation technology, which extracts sufficient amount of fat tissue needed from the parts of the body with more fat, such as abdomen, iliac waist, buttocks, thighs, etc., and injects it into the parts that need to be filled after purification and concentration treatment. The purpose of body shape shaping and contour reconstruction is achieved. The safety of autologous fat filling is reflected in the following points: 1. Safety of filler: Autologous fat filler comes from the human body’s own tissue, so it is far better than other prosthetic materials from the perspective of biology, and since the filler is non-toxic and harmless to people, it is certainly safe. 2.Safety of filling process: Autologous fat filling uses syringes or special fat aspirators to extract the right amount of fat from the parts of the body where there is more fat, and then purified and concentrated. The treatment will only leave a wound the size of a pinhole at the collection site, and its recovery is fast and pain is low. Candidates who are afraid of pain are recommended to use intravenous sedation anesthesia to significantly reduce the pain and improve the comfort of the treatment process. 3, filler safety: autologous fat filling site is the subcutaneous fat layer of the human body, will not hurt the body’s blood vessels and nerves, fill the site after the survival of fat cells, become part of the site, both the feel and appearance are very beautiful, there is no after-effects of the future. 4, choose the right hospital, choose the right doctor: the effect of cosmetic surgery and the choice of hospital, doctor technology are directly related, seekers must have a discerning eye for right and wrong, to the regular plastic surgery hospital to find a qualified doctor to perform surgery, can significantly reduce the occurrence of post-operative complications.