Because preschoolers generally lack the control to tighten the abdomen and tense the thigh muscles, thus failing to control and stabilize the pelvic position. At this time, let the child learn to do twisting, bending waist and other movements, easy to cause anterior pelvic tilt. Coupled with the dance cervical spine over-extension, excessive rapid rotation of the action, easy to cause the rotational subluxation of the cricoid vertebrae, these may ultimately cause lumbar spine, cervical spine problems. Children's spine in the process of development, many epiphyses have not yet closed, the bone has not yet grown strong, repeated lower back, excessive force, excessive weight-bearing splits and other actions may cause lumbar spine bone damage, or even lumbar isthmus fracture. If not diagnosed and treated in time, chronic lumbar pain may occur in the future, or even lumbar spine slippage, affecting normal life. In addition, the child's balance ability is weak, in the high-intensity dance practice can not stand stable, fall and injury is more common.