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Objective: To determine the effects of recombinant soluble complement receptor type I (sCR1) on the immune inflammatory reaction in acute spinal cord injury tissue of rats and its protective effects. Results: The motor function of rat in sCR1 group at 3 d, 7 d, and 14 d was obviously better than that in NS group (P<0.01, P<0.01, P<0.01). C3c positive expression in sCR1 group at each time point after injury was obviously less than that in NS group (P<0.01). The myeloperoxidase activity in sCR1 group at each time point after injury was obviously less than that in NS group (P<0.01). Conclusions: Recombinant soluble complement receptor type I (sCR1) can lessen the immune inflammatory reaction in acute spinal cord injury tissue and relieve secondary spinal cord injury by inhibiting the activation of the complement system.