Abstract: Polymorphisms of partial sequence of KAP3.2、KAP7 and the exon of KAP8 were studied in plateau Tibetan sheep by PCR-SSCP, and the correlation between polymorphism of KAP and the traits of wool length and wool yield were analyzed using least square linear model. To determine the preponderant marker for every trait, the selection reaction was forecasted via the genetic correlation between polymorphic loci and economic traits. The results showed that there were polymorphisms at three gene loci, and were detected three genotypes including AA, AB and BB. For the wool length trait, AA of KAP3.2 and KAP7 was significantly higher(P＜0.05）than BB. For the wool yield trait, AA of KAP3.2 was significantly higher(P＜0.05）than AB and BB, AB of KAP8 was significantly higher(P＜0.05）than AA and BB. The selection reaction of KAP3.2 was higher than KAP7 and KAP8, and it could be regarded as a preponderant marker for wool length and wool yield.