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[Objectives] The effects of condensed quebracho tannins on the production performance and blood routine indices of Simmental fattening cattle were investigated experimentally. [Methods] Twenty four Simmental fattening cattle were selected and randomly divided into two treatment groups according to their body weight, with 12 animals in each group. The diet of the control group consisted of beef cattle concentrate supplement +silage +hay, and the diet of the experimental group consisted of beef cattle concentrate supplement + silage + hay + tannins, and the experimental period was 30 d. [Results] Compared with the control group, the addition of tannins [30 g/( cattle · d) J to the diet of beef cattle increased the daily weight gain of Simmental beef cattle by 24. 68% (P<0.01), while the feed conversion ratio decreased by 2. 57% (P >0.05) . The gross profit per cattle increased by 973. 63 yuan, and the economic benefit increased by 114. 78%. Platelets were higher in the experimental group than in the control group (P < 0. 01) ; hemoglobin was lower in the experimental group than in the control group (P< 0.01) ; leukocytes, neutrophils, monocytes and lymphocytes were lower in the experimental group than in the control group (P< 0. 01) ; and erythrocytes were lower in the experimental group than in the control group (P< 0.05). [Conclusions] This study provides a theoretical basis for the rational utilization of quebracho tannins. [ABSTRACT FROM AUTHOR]