Separation anxiety in children occurs before the age of six years and refers to excessive anxiety when a child is separated from an attachment figure; excessive worry that the primary attachment figure may be harmed or that they may not return; fear of being separated from the primary attachment figure; unwillingness or refusal to go to kindergarten or school because of fear of being separated (not because of kindergarten or school); unwillingness or refusal to go to bed without the primary attachment figure; a persistent and inappropriate fear of being alone, fear of staying at home without the attachment figure; recurrent nightmares related to the separation; excessive and recurrent distress, which may be characterized by crying, tantrums, distress, indifference, or withdrawal, immediately upon anticipation of separation from the attachment figure; and recurrent post-separation somatic symptoms, such as nausea, vomiting, headache, stomachache, and malaise, in some children. Predisposing factors for separationanxiety include mandatory separation, such as the death of a parent, illness, or parental separation. These factors are prone to induce anxiety in children who have genetic qualities. 1, genetic factors Children born to parents with anxiety disorders have a significantly higher incidence of anxiety disorders than children born to normal parents. And identical twins anxiety disorder of the same disease rate can be as high as 50%, all of these indicate that the separation of anxiety disorder and genetic have a close relationship. 2, parent-child excessive attachment Suffering from separation anxiety of the child usually has been with the mother or fixed foster together, not with the outside world contact, and the mother is often too precious to the child, overprotection, do everything, everywhere on behalf of the work, so that the child has developed into a timid, shy, dependence, can not adapt to the outside world environmental weaknesses and the mother of the personality and excessive attachment. Once suddenly separated from the mother, it is easy to appear separation anxiety. 3, the impact of life events before the emergence of separation anxiety, often have life events as a trigger, common life events for the sudden separation of parents, frustration in kindergarten, unfortunate accidents, such as serious illness or death of a loved one, and so on.