This experiment was to study the effects of dietary different plant essential oils on growth performance, intestinal development, immune organ indexes and slaughter performance of broilers. A total of 2 304 one-day-old Ross 308 male broiler chickens were randomly divided into 6 groups with 12 replicates per group and 32 birds per replicate. Chickens in group 1 (control group) were fed a basal diet; chickens in group 2 (negative control group) were fed the basal diet supplemented with antibiotic (20 mg/kg virginiamycinin); and the others in the groups 3 to 6 were fed the basal diet supplemented with 4 kinds of plant essential oils, including 100 mg/kg plant essential oils 1 (contained 0.5% carvacrol, EO1 group), 300 mg/kg plant essential oils 2 (contained 0.5% carvacrol, EO2 group), 300 mg/kg plant essential oils 3 (contained 8% carvacrol and thymol mixture, EO3 group) and 300 mg/kg plant essential oils 4 (contained 2% carvacrol and thymol mixture, EO4 group), respectively. The experiment lasted for 39 days. The results showed as follows:1) compared with the control group, the ratio of feed to gain (F/G) of broilers at 22 to 31 days of age in negative control group and EO2 group was significantly decreased (P<0.05), which was decreased by 2.58% and 3.51%, respectively. Compared with the control group, the average daily gain (ADG) of broilers at 1 to 38 days of age in negative control group was increased (P>0.05), and the F/G was decreased (P>0.05). Dietary different plant essential oils had no significant effects on average daily feed intake, ADG and F/G of broilers at 1 to 38 days of age (P>0.05). 2) Compared with the control group, dietary different plant essential oils tended to increase the duodenum villi height of broilers at 39 days of age (P=0.075 3), and the value of villi height to crypt length ratio was increased (P>0.05). 3) There were no significant differences in spleen index and bursa of Fabricius index of broilers at 22 and 39 days of age among all groups (P>0.05). Moreover, there were no significant differences in carcass yield, breast yield, thigh yield, wing yield and abdominal fat yield of broilers among all groups (P>0.05). It is concluded that under this experimental condition, dietay plant essential oil has no effect on growth performance of broilers, but it is beneficial to duodenum villi development.