Family who lost the only child belongs to the social phenomenon and social problem which has its characteristic，sudden accident will extremely hit the one-child family which is risky.How to make the lost-only-child family when their value has lost or desperate to restore，and how to help the lost-only-child family facing family breakdown to reconstruct，that obviously is the key to rebuild life confidence of the lost-only-child family.When social policy has not been perfectly detailed，social work that has the unique professional concept，method and skill，can play a special role in localization of exploration on value reshape and reconstruction of the lost-only-child family.