Abstract: Choosing KAP gene as candidate gene, the genetic relationship between KAP gene and economic traits (cashmere yield, weight and cashmere fineness ) of 60 Inner Mongolia cashmere goats were analyzed by PCR-SSCP method, using GLM procedure of SPSS software. The result showed: BB genotype at S1 site and BB genotype at S2 site was favorable marker genotype for cashmere yield trait, BB genotype at S2 site and AA genotype at S3 site was favorable marker genotype for weight trait. BB genotype at S5 site was favorable marker for cashmere fineness trait. BB genotype at S2 site can be the marker genotype of multi-trait marker in assistance selection.