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Objective: To study the clinical efficacy of Jinghuang tablet (Rhubarb extract tablet, RET) in treating simple obesity. Methods: Four hundred and seventy-two simple obesity patients were randomly divided into 3 pairs of groups: (1) RET-2 treated group (50 cases): treated with RET vs west drug fenfluramine control group (50 cases). (2) RET treated group vs Chinese patent drug Xiaopangmei (XPM) control group with 50 cases randomly divided into each. (3) RET-1 treated group with 137 cases vs blank control of 135 cases. The aim was to observe markedly effective rate, effective rate and side-effect of RET group and fenfluramine and XPM control groups. At the same time, the slimming efficacy of RET-1 treated group and the blank control group were observed. Results: The slimming effective rate of RET is similar to that of fenfluramine (P<0.05), and better than domestically well accepted slimming Chinese patent drug XPM (P<0.05). In comparing RET-1 group with blank control group, the difference of weight loss of the 2 groups after 1 week treatment was 0.93 kg on average, which was significant. Conclusion: The efficacy of RET in treating simple obesity was similar to that of fenfluramine, but the side-effect was obviously less than that of fenfluramine, while the markedly effective rate and effective rate in slimming were significantly better than that of XPM.