Abstract: The aim of the present study was to evaluate the selective breeding achievements in Selective Breeding Farm for Yanchi Tan Sheep of Ningxia, and to assess the hereditary capacity of main economic traits of Yanchi Tan Sheep. A total of 110 lambs （35±5） days of age were selected from a herd of 369 lambs and their hereditary capacity of the main economic traits was investigated. The results showed that the heritability of birth weight, hair length in body side, number of curls in body side, corrected body weight at 35-day-old of age, corrected hair length in body side at 35-day-old of age, and corrected number of curls in body side at 35-day-old of age was 0.02, 0.07, 0.04, 0.13, 0.09 and 0.12, respectively. These data suggest that the selected six economic traits of the confined Tan Sheep in this breeding farm belong to low heritability traits.