Abstract: In order to study on the regular pattern of growth in piglet, the data were collected from 1871 Landrace piglets and 140 Large Yorkshire piglets in 1998-2002. The weight at birth, 20-day body weight and weight at weaning（60-day body weight）were determined in pig trial farm of Northwest A&F University. The growth rate and growth intensity such as cumulative growth, absolute growth, relative growth and growth coefficient at lactation period were calculated. The results shown that no significant difference (P>0.05) was in the weight at birth between Landrace and Large Yorkshire; the growth rate (absolute growth) and growth intensity (relative growth) of Landrace are all significant higher (P<0.05) than those of Large Yorkshire at 20-day and 60-day of age; the growth intensity (relative growth) of gilt are all significant higher (P<0.05) than those of little boar in same breed at 20-day and 60-day of age.