Autism spectrum disorder（ ASD） is a group of neurodevelopmental disorders with unknown etiology. Previous studies have suggested that abnormal brain functional connectivity may be the pathological basis of ASD. It has been seen of great significance that collaboration among different brain regions for cognitive tasks. Electroencephalogram（ EEG） coherence is regarded as the expression of that collaboration， which can be used as evaluation index of brain connectivity， and has wide application prospect of neuropsychological mechanism in autism.