Abstract: Objective: To investigate the risk factors of transient ischemic attack(TIA) evolving into cerebral infarction.Methods: The clinical data of 32 cases with TIA evolving into cerebral infarction(cerebral infarction group) and 97 cases with TIA no-evolving into cerebral infarction(TIA group) within 6 months were statistically analysed.Results: The indicators of hypertension,unstable carotid plaques,diabetes,duration of attack more than or equal to 30 minutes and attack frequency more than or equal to 3 times in cerebral infarction group were higher than those in TIA group(P<0.05 to P<0.01).The differences of sex,smoking history and coronary heart disease between two groups were not statistically significant(P>0.05).The patient age of cerebral infarction group was higher than that in TIA group(P<0.05).The differences of the levels of FBG,triglycerides,cholesterol,LDL and serum uric acid between two groups were not statistically significant(P>0.05).Conclusions: The incidences of TIA evolving into cerebral infarction in the patients with long lasting time and frequent attacking of TIA complicated with hypertension,diabetes,advanced age and unstable carotid plaques are higher.