The human body has passed the normal developmental period, or the body parts are unable to realize the developmental conditions, the use of drugs can not promote secondary development. Development refers to the process of gradually perfecting and maturing the structure and functions of each part of the body. The peak of normal development of the human body is during puberty, during which the body’s hormone secretion increases dramatically, height grows rapidly, and secondary sexual characteristics appear, so it is a good time to intervene to promote development. However, if you miss this period and still want to continue to develop, it depends on whether the developmental conditions are in place, such as the growth of human height depends on whether the epiphyses of the two ends of the long bones are healed or not, if the healing has already occurred, the use of any medication, exercise and other ways can not make the height continue to grow. Therefore, in order to know whether the human body can continue to develop, or want to achieve the second development, we must seize the key period, have the conditions of human development. Therefore, we should pay attention to grasp the key period of physical development, timely supplementation of nutrients, strengthen sports. Failure to achieve the development conditions, or miss the development period, can not promote continued development.