The experiment was conducted to investigate the effects of dietary Na+ and Cl- level on growth performance, excreta moisture, blood biochemical variables, and carcass traits in broilers, and to estimate the optimal dietary sodium and chlorine level for yellow-feathered broilers fed a corn-soybean meal diet. A total of 2850 1d, 22d, and 43d male broilers were randomly assigned to one of five dietary treatments. Each treatment consisted of six replicates with 40 birds per replicate in the trail of 1–21 days of age or 30 birds per replicate in the trail of 22–42 days of age or 25 birds per replicate in the trail of 43–63 days of age. Dietary treatments included the basal diet (control, and without additional Na+ and Cl-) and the basal diet supplemented with NaCl and NaHCO(3) (the ratio of Na+ and Cl- is 1:1 in dietary, and the dietary Na+ and Cl- levels are 0.1%, 0.2%, 0.3%, and 0.4%). Feed and water were provided ad libitum. Results showed that dietary supplemental Na+ and Cl- significantly improved the growth performance, and daily water consumption of broilers (P