Abstract: Objective：To compare the roles of single nucleotide polymorphism array (SNP array) and karyotype analysis in high-risk pregnant women prenatal diagnosis. Methods: From July 2012 to December 2013, a total of 141 pregnant women with high-risk in prenatal diagnosis were selected as the object of study in Department of Obstetrics and Gynecology, Peking University Third Hospital, 78 cases of umbilical cord puncture and 63 of amnion cavity puncture , both taking SNP array detection and karyotype analysis. Results: The abnormality karyotype rate was 6.4%, the abnormal rate of SNP array result was 11.3%, and the abnormal rate of the combined two methods for detecting was 12.1%. There were significant differences between the SNP array and karyotype analysis (P=0.039). Conclusion: There were obvious differences between the two techniques. It is an effective way to determine genetic disease by integrating SNP array and karyotype analysis in prenatal diagnosis.

Key words: Polymorphism, single nucleotide, Micoarray analysis, Karyotype, Prenatal diagnosis