The effects of rearing system and stocking density on growth performance and carcass composition of broilers were investigated in this experiment. Using a 3×2 factors completely randomized design, a total of 504 seven-day-old male broilers (Ross 308) were divided into 6 groups with 6 replicates per group, respectively. Three rearing systems were designed as battery rearing, floor rearing and net rearing. Two stocking densities were designed as normal density (12 birds/m²) and high density (16 birds/m²). This test lasted for 35 d. The results showed as follows: 1) Rearing system had significant effect on average daily feed intake (ADFI), average daily gain (ADG) and feed to gain ratio (F/G) of broilers aged from 7 to 28 and 29 to 42 days (P<0.001). At 7 to 28 days of age, ADFI of broilers appeared as floor rearing>battery rearing> net rearing, ADG appeared as floor rearing> net rearing> battery rearing, F/G appeared as net rearing< floor rearing< battery rearing. At 29 to 42 days of age, floor rearing significantly enhanced ADFI of broilers compared with battery rearing and net rearing (P<0.05). Battery rearing significantly enhanced ADG of broilers compared with floor rearing and net rearing (P<0.05). F/G appeared as battery rearing> net rearing> floor rearing. High stocking density had the trend to decrease ADFI of broilers aged 7 to 28 days (0.05<P<0.10), significantly decreased BW of broilers aged 28 days (P<0.01), but did not significantly affect F/G (P>0.05). At 29 to 42 days of age, high stocking density had the trend to increase ADFI of broilers (0.05<P<0.10), significantly decreased BW and increased F/G of 42days broilers (P<0.01). 2) Battery rearing significantly decreased breast yields compared with the other two feeding system (P<0.05), high stocking density significantly increased abdominal fat yields (P<0.05). 3) The pH₁ of breast muscle at 45 min after slaughter was significantly decreased in battery rearing (P<0.01). High stocking density significantly decreased pH₁ and increased water-loss rate of breast muscle (P<0.05). 4) Floor rearing had the highest luminance (L^*) and yellowness (b^*), and had the trend to decrease redness (a^*) of leg muscle, whereas, battery rearing group appeared the contrary effect, had the trend to decrease L^* and b^*, and increase a^*. High stocking density significantly decreased pH₁ (P<0.01) and significantly increased the ether extract content of leg muscle (P<0.05). Significant interactive effects between rearing system and stocking density were appeared in pH₁ of leg muscle (P<0.01), high stocking density significantly decreased pH1 of leg muscle of broilers in floor rearing and net rearing system (P<0.05) but not in battery rearing system (P>0.05), and the lowest pH₁ of leg muscle was appeared in floor rearing with high stocking density group. In conclusion, rearing system and stocking density have affect on the growth performance of broilers with no interaction is found. The interaction is found in meat quality of leg muscle, and high stocking density in floor and net rearing system can significant affect the leg muscle quality.