Mutations in the glucose-6-phosphatase (G6Pase) gene are responsible for glycogen storage disease type Ⅰa (GSD Ⅰa).By genotype analysis of the affected pedigree, we identified a novel type mutation in a Chinese patient with GSD Ⅰa.Mutation analysis was performed for the coding region of G6Pase gene using DNA sequencing and TaqMan gene expression assay was used to further confirm the novel mutation.The proband was compound heterozygous for c.311A>T/c.648G>T.Our report expands the spectrum of G6Pase gene mutation in China.