Objective To compare between the impact of Xuebijing injectio (a Chinese herbal medicine preparation) and that of low molecular weight heparin (LMWH) on coagulation function and prognosis in patients with severe sepsis, so as to guide the treatment of sepsis. Method A total of 89 patients with severe sepsis were randomly(random number) divided into 3 groups, namely Xuebijing group (group A),LMWH group (group B) and routine group (group C). The patients of group C received a series of remedies according to the guideline for severe sepsis. The patients of group A were treated with Xuebijing injectio in addition to routine treatment. The patients of group B were treated with LMWH along with routine treatment.Data of blood coagulation function tests and APACHE Ⅱ score of patients in three groups before and after treatment were analyzed respectively. The 28-day mortality and length of hospital stay were compared among three groups. All data were analyzed by using t-test, Analysis of Variance, q-test, x2-test and rank sum treatment, all markers of the blood coagulation function tests in group A improved significantly after treatment (P＜0.01), while only some markers of the blood coagulation function tests improved in the other two groups ( P ＜ 0. 05 or P ＜ 0. 01 ); After treatment, the blood coagulation function in group A improved significantly more than that in other two groups ( P ＜ 0.05 ), while there were some markers of the blood coagulawith the data before treatment, the APACHE Ⅱ score in group A and group B decreased after treatment (P＜0.05). After treatment, the APACHE Ⅱ score of group A and group B decreased significantly more than that of group C ( P ＜ 0.05). But there was no significant difference between group A and group B ( P ＞Xuebijing obviously improves the blood coagulation function in patients with severe sepsis, while LMWH only improves some markers of the coagulation function tests. Both Xuebijing and LMWH reduce mortality and improve prognosis of patients with sepsis.