This experiment was conducted to investigate the effects of dietary different chromium (Cr) sources and levels on growth performance, carcass traits and meat quality of broilers aged from 1 to 3 weeks under heat stress. A total of 252 one-day-old female Cobb broilers were randomly allotted into 7 groups with 6 replicates per group and 6 broilers per replicate. Broilers in the control group were fed a basal corn-soybean meal diet containing 0.37 mg/kg Cr, and the others in experimental groups were fed the basal diet supplemented with 0.4 or 2.0 mg/kg Cr as either Cr propionate (CrPro), or Cr picolinate (CrPic), or Cr chloride (CrCl₃), respectively. The experiment lasted for 21 days. The results showed as follows: 1) Cr source, Cr level and interactions between Cr source and level had no effects on average daily feed intake and feed to intake ratio in broilers aged from 1 to 3 weeks under heat stress (P>0.05), however, the average daily gain in experimental groups was significantly increased compared with that in control group (P<0.05). 2) No differences were observed in the live body weight, dressing percentage, whole pure thorax percentage, breast muscles percentage and thigh muscle of broilers aged from 1 to 3 weeks under heat stress (P>0.05), however, the dressing percentage in experimental groups was significantly increased compared with that in control group (P<0.05). There were significant differences among Cr sources in the of abdominal fat percentage (P<0.05), and CrPro group did the best, followed by the CrCl₃, with the CrPic coming in last. 3) The a^* value in experimental groups was significantly increased compared with that in control group (P<0.05). There were significant differences among Cr sources in the cook loss (P<0.05). Cr source, Cr level and interactions between Cr source and level had no effects on the shear force, pH, L^* and b^* value of the breast muscle (P>0.05). It is concluded that Cr supplementation can improve the growth performance, carcass performance and meat quality of broilers under heat stress, and it is better to supplement Cr from CrPro and CrCl₃ than CrPic in the diet of broilers under heat stress.