Abstract: The polymorphisms in the 5th exon of DECR1 gene were detected using PCR-SSCP in 192 Shanxi white pigs. And the effects of different genotypes on growth traits of Shanxi white were analyzed by least square analysis. The results showed that the polymorphisms in the 5th exon site were found and three genotypes were CC，CD and DD，respectively. The polymorphisms of DECR1 gene had significant association (P＜0.05) with body weight，body height and chest girth at six-month age. Pigs with genotype CD had significantly higher body weight，body height and chest girth at six-month age than those with DD (P＜0.05). There were no significant differences among three genotypes on body lenth (P＞0.05)，but the tendency of CD＞CC＞DD was showed. And in this site，there were no significant differences among three genotypes on backfat thickness (P＞0.05)，while the tendency of CC＜CD＜DD was showed either. Therefore，genotype CD may have positive genetic effect on growth performance.

Key words: DECR1 gene; growth traits; polymorphism; PCR-SSCP; pig