Abstract: [Objective amd Method]This research was conducted to study the effects of adding sodium fumaric acid (SFA) on digestion and metabolism of sheep. Eighteen male China merino(Xinjiang type) sheep were selected and randomly divided into three groups, 6 sheep in each group. 10 g and 20 g of sodium fumaric acid were added to the diet of groupⅡand group Ⅲ, respectively. [Result]The results showed that the DM intake and the amount of the digestible OM, CP, cellulose, semi-cellulose in control group was 1414.05±59.71, 917.89±44.43, 68.56±2.67, 284.98±21.99, 162.59±28.67, 1.70±0.73, 0.45±0.16(g/d), and when 10, 20 g SFA/d was fed, they were increased by 7.71;, 13.98;, 10.54;, 21.4;, 5.7;, 15.45;, 20.73;, 33.37;, 21.7;, 27.79;, 14.12;, 23.53; and 4.44;, 13.33;. The apparent digestibility of OM, CP, cellulose, semi-cellulose, Ca, P in control group was 69.46±1.21, 64.78±2.74, 69.62±1.97, 61.75±8.64, 17.77±7.38, 21.24±7.31(;), when 10, 20 g SFA/d was added, they were increased by 2.79;, 6.74;, 1.42;, 6.47;, 8.17;, 9.78;, 12.23;, 11.71;, 7.99;, 11.37; and 1.65;, 8.8;. The average body weight gain and the retention of N, Ca and P was 123.19±65.46, 7.08±0.35, 1.19±0.72, 0.43±0.16(g/d), when 10, 20 g SFA/d was supplemented, they were increased by 26.46;, 29.40;, 5.65;, 11.86;, 23.53;, 41.18; and 6.98;, 16.28;. [Conclusion]The present study showed that SFA could increase the intake, increase the amount of the digestible DM, OM, cellulose, semi-cellulose, increase the apparent digestibility of DM, OM and cellulose when 20 g/d was added, however, there was no significant effects of two different amounts of sodium fumaric acid on the Ca and P metabolism.