Objective To analyse firstly diagnosed children and adolescents by age,sex,disorder distribution in children comprehensive hospital's psychology clinic.Methods A total of 8 916 cases in psychological clinic in Children's Hospital of Fudan University were firstly diagnosed with complete data from 2010 to 2014,medical record data were analyzed on sex,age and other demographic characteristics,and diagnostic classification,intervention statistics,analysis distribution of the each disorder.Results The patients increased every year,the average rate of increasing was 18.17%.The age ranged from 0 to 18 years old,with an average age of 6.64±3.47,the largest age group was from 0 to 6 years old.There were more boys than girls,male to female ratio was 2.79∶1.The rate of various mental disorder was 70.1%,according to the proportion,the top five were attention deficit hyperactivity disorder (ADHD),mental retardation (MR),pervasive developmental disorder (PDD),speech and language disorders,somatoform disorders,of <6 years old age group were:pervasive developmental disorder (PDD),mental retardation (MR),attention deficit hyperactivity disorder (ADHD),of 7~12-year-old children were ADHD,PDD,MR,pervasive developmental disorder,mental retardation,while the most common mental disorder in puberty group were ADHD,MR,mood disorders and psychosomatic disorder.Conclusion The mental problems in children presents different characteristics in different ages and genders of the children,psychology clinic in children comprehensive hospital need to provide mental health service to the society.