The key to prevent postpartum obesity lies in the reasonable collocation of postpartum diet and proper exercise. Postpartum should eat more lean meat, bean products, fish, eggs, vegetables, fruits and other foods, and eat less high-fat and high-sugar foods. At the same time, exercise as soon as possible. Generally, women who give birth naturally should get out of bed and exercise properly within 24 hours after delivery, because exercise can enhance the function of neuroendocrine system, promote the regulation of human metabolism and consume too much fat and sugar in the body. In addition, it is necessary to breastfeed as soon as possible, because breastfeeding can accelerate milk secretion, promote maternal metabolism, transport redundant nutrients in body tissues, and reduce the accumulation of subcutaneous fat. In short, to prevent postpartum obesity, we should pay attention to it from all aspects and persevere in order to receive good results.