Simple obesity can occur in children at any age, generally in the age of 1 year, 5-6 years and pre-puberty. The weight of the affected children often exceeds the weight standard by more than 20%, with good appetite, and generally have the habit of overeating, preferring to eat oily and starchy food, sweets and snacks. Simple obese people have more subcutaneous fat, but it is evenly distributed. Facial fat accumulation, the formation of double chin, mouth, nose relatively small, torso and double breast, abdomen, shoulder fat accumulation for more. Breast fat accumulation is often misdiagnosed as breast development in both men and women. Men are often misdiagnosed as having cryptorchidism because the penis sinks into the mons pubis or the testicles sink into the groin. The fat accumulation in the upper arms and thighs is more, which makes the hands and feet relatively smaller and the fingers (toes) thinner. The skin of the abdomen, buttocks and thighs of severely obese children often appear pink and purplish cracks. Because of obesity, children are easily teased by their peers, which will cause psychological disorders, low self-esteem, loneliness, incompatibility, timidity, and affect social life. Self-image and self-awareness decline, reducing contact and interaction with peers and people around, forming introversion, loneliness and lack of competitiveness, affecting learning, self-confidence and competitive ability.