At present, there are more than 20,000 human genes have been discovered, with a total of more than 180,000 exons. Genes are composed of exons and introns, where exons are DNA regions directly involved in protein coding, accounting for about 1-2% of the entire human genome, and about 85% of human genetic variation is concentrated in the exon region. Therefore, WES test can provide comprehensive and powerful information for the diagnosis of diseases.