Abstract: Objective To observe the therapeutic effects of L-ornithine-L-aspartate on liver cirrhosis complicated by hepatic encephalopathy. Methods Eighty-five patient with liver cirrhosis complicated by hepatic encephalopathy were divided into therapy group (n=45) and control group (n=40). Patients in the control group were treated with routine comprehensive therapy, and those in the therapy group received additional intravenous administration with 40 ml L-ornithine-L-aspartate in 250 ml 10% glucose and saline (once daily, 7 days for a treatment course). Results L-ornithine-L-aspartase significantly decreased blood ammonia and improved hepatic function (P<0.05 or 0.01). The therapeutic effects of therapy group was better than that of the control group (P<0.05), and no significant side effect was observed in L-ornithine-L-aspartate treatment. Conclusion L-ornithine-L-aspartate is effective for hepatic encephalopathy and has not obvious side effect.