Abstract: Seventy Yorkshire weanling pigs (average initial mass of 5.4 kg and age of 21 d) were randomLy assigned into five groups. The diet treatments were 0(15 mg/kg of Cu in basic diet), 50, 100, 200 mg/kg of supplement Cu from Culys or 200 mg/kg of supplement Cu from copper sulfate (CuSO 4).The experiment period was 42 d. Average daily gain increased linearly ( P <0 05) with increasing dietary level of Cu, with no difference among 100 mg/kg of supplement Cu from Culys, 200 mg/kg of supplement Cu from Culys or CuSO 4 ( P >0 05). The addition of 200 mg/kg of supplement Cu from CuSO 4 stimulated duodenum lipase activity ( P <0 05), but with no effect ( P >0 05) on pancreas lipase activity. The addition of different level of supplement Cu from Culys improved duodenum lipase activity but the difference was not significant ( P >0 05). The result showed that Culys is an excellent Cu rsource, lower doses of Culys could get the same effect as higher doses of CuSO 4.