The aim of this study is examine the ability of xylanase (XY), fresh whey (FW), dried whey (DW) alone or in combination to improve broiler low energy diet containing 30% wheat bran (WB). This experiment conducted in Egypt from April to May (23.9 ^oC-34.8^oC).Two hundred and ten unsexed Cobb broiler chicks seven days old were randomly distributed into seven treatments received control diet, WB (30%) diet,WB+0.1%XY, WB+1% FW,WB+ 0.5% DW, WB+ XY +1% FW or WB+ XY + 0.5 % DW. At 35 days. Birds fed WB diet recorded significantly higher body weight by 2.43% compared to control diet. The birds fed WB +XY was significantly higher in body weight compared to all treatments. Dried whey failed in affecting performance of WB diet. Addition of XY to WB diet significantly increased carcass percentage compared to WB diet or control diet. Wheat bran diet alone increased plasma globulin and phosphorus by 114.8 and 48.54 %, respectively compared to control diet. Xylanase is a suitable additive for WB diet. It could be concluded that the diets containing 30 % wheat bran low energy diet alone or with 0.1% Xylanase improve broiler performance under condition of this study.