Objective To explore the characteristics of vascular cognitive dysfunction in patients with acute ischemic stroke and its influence on functional prognosis.Methods 103 out of 125 patients with acute ischemic stroke admitted from September 2017 to September 2018 were enrolled in the study. The patients were assessed with NIHSS, MMSE, MBI and mRS respectively. The evaluation results of vascular cognitive impairment during hospitalization were analyzed. Results Male language dysfunction was significantly lower (P＜0.05). The bilateral and unilateral language dysfunction was significantly higher than that of right (P＜0.05). The length of stay in hospital was significantly longer in patients with visual spatial disorder and executive dysfunction (P＜0.05). There was no difference in age distribution between the four dimensions (P＞0.05). Non memory impairment (P＞0.05) MMSE score of patients with memory impairment was significantly lower than that of patients with non visual spatial impairment (P＜0.05). NIHSS score of patients with visual spatial impairment was significantly higher than that of patients with non visual spatial impairment (P＜0.05), MMSE and MBI scores were significantly lower (P＜0.05). MMSE score of patients with language impairment was significantly lower than that of patients with nonverbal impairment (P＜0.05). MMSE score of patients with nonexecutive dysfunction was significantly lower than that of patients with nonvisual spatial impairment (P＜0.05) The NIHSS score of patients with executive dysfunction was significantly higher (P＜0.05), MMSE and MBI scores were significantly lower (P＜0.05). Conclusion patients with acute ischemic stroke have a high probability of vascular cognitive impairment, in which visual space disorders and executive dysfunction have a significant impact on functional prognosis.