Abstract: The nucleus herd was composed by 115 sows and 23 boars imported from Hybrid Company of France in 2001, and 78 sows and 6 boars from Pig Breeding Center of Beijing. The open systematic breeding and the Best Linear Unbiased Prediction (BLUP) method were used in the breeding system. The specialized line W62 was obtained after nearly ten years of breeding. The line W62 possessed the characters of high and long body and high reproduction performance. This line was a suitable dam line in the WS501 Synthetic Line.