Grieving following the death of loved ones is a natural and necessary process. Many people experience it and grief symptoms of most people recover over time, but a group of people haven’t skills and abilities that are needed to solve the mourning process, which could be source of many psychological problems. Bereaved children are vulnerable group and they are at risk of social and psychological damage. Although many symptoms that occur immediately after the death of loved person gradually reduce after 6 to 12 months, but the difficulties of some children continue, so this children require clinical intervention. This article presents diagnosis and treatment of prolonged grief symptoms in children. For this purpose the characteristics of normal and abnormal grief in childhood and factors that influence how children react to loss have been explained and then conducted interventions and research in this area have been indicated.