The present invention relates to a method of predicting the risk of developing ankylosing spondylitis using DNA copy number variation. It was verified that the risk of developing ankylosing spondylitis can be effectively predicted using primers for detecting DNA copy number variation, of the present invention, and the sensitivity and specificity of prediction can be improved by grafting the results of single nucleotide polymorphism (SNP) measurements, and thus more fundamental approaches for preventing and treating ankylosing spondylitis are expected.