Objective: To Study the distribution of syndrome differentiation by traditional Chinese medicine(TCM) for acute cerebral infarctiona (ACI) in Chongming area and relationship with the blood viscosity. Method: Three hurdred and fourteen patients with ACI were divided into five groups: the syndrom of upward invading of wind-fire

wind-phlegm blocking

phlegm-heat FU-organ excess

blood stagnancy due to Qi-deficiency

wind syndrom due to YIN-deficiency according to the differentiation standard of syndromes based on TCM. Blood viscosity was detected and the proportion of ACI patients with above syndroms were analyzed. Result: The proportion of wind-phlegm blocking and blood stagnancy due to Qi-deficiency were higher than other groups(P<0.05). The blood viscosity of five group was higher than normal roups(P<0.05 or P<0.01)

and the statistical difference was found in five groups (P<0.05). Conclusion: The results indicates that there exists a relativity betweenblood viscosity and syndrome differentiationbased on TCM and in Chongming area

wind-phlegm blocking and blood stagnancy due to Qi-deficiency may be main syndrome of ACI.