To observe the effects of Xiaochaihu Decoction on vertigo after stroke,and to analyze its mechanism.Methods:A total of 90 patients with post-stroke vertigo admitted to the First Clinical Medical College of Shandong University of Traditional Chinese Medicine from January 2015 to September 2016 were randomly divided into the control group and the observation group according to the random number table method,with 45 cases in each group.The control group was given flunarizine orally and Shuxuening Injection intravenously.The observation group was given Xiaochaihu Decoction on the basis of the above treatment,with 1 dose per day,and 200 mL decoction was taken in the morning and evening.The two groups were treated for 10 d continuously,and the changes of clinical nerve function defect scale (NDS),Fugl-Meyer score,daily living ability (ADL) score,Berg balance scale score (BBS) and hemorheological indexes were compared before and after treatment in the two groups.Results:1) There was no significant difference in NDS score,FCA score,Fugl-Meyer score and ADL score before treatment (P>0.05).After 10 days' treatment,the NDS scores of the two groups were decreased,and FCA score,Fugl-Meyer score and ADL score were all improved.The difference was statistically significant compared with those before the treatment (P<0.05).The observation group was superior to the control group; 2) there was no significant difference in BBS score,MSQ,HAMA and HAMD score in the two groups of patients before treatment (P>0.05).After 10 days' treatment,the BBS scores in two groups were increased.MSQ,HAMA and HAMD scores were all decreased,and the difference was statistically significant compared with those before the treatment (P<0.05).The observation group was superior to the control group; 3) there was no significant difference in the levels of PV,FIB and WBV in the two groups before treatment (P>0.05).After 10 days' treatment,the levels of PV,FIB and WBV decreased in two groups,and the difference was statistically significant compared with that before treatment (P<0.05).The observation group was superior to the control group; 4) the total effective rate was 97.78% in the observation group,which was significantly different from 70% in the control group (P<0.05,χ2=2.88).Conclusion:Xiaochaihu Decoction has an ideal effect on vertigo after stroke,and it may achieve therapeutic effect by improving hemorheology.