Objective To study the application value of low dose CT perfusion imaging in patients with ischemic stroke of convalescence. Methods One hundred patients with recovery stage of ischemic stroke were selected as object of study from March 2013 to March 2015 in our hospital. According to the stochastic indicator method, the patients were divided into observation group and control group of 50 cases each. in the two groups of patients, on the basis of routine scan control group using conventional dose (120 kv, 200 mvas) CT perfusion imaging, observation group with low doses (80 kv, 200 mvas) CT perfusion imaging. The two groups were measured in patients with cerebral blood flow (CBF), cerebral blood volume (CBV), mean transit time (MMT), time to peak (TTP). Results Compared two groups of patients, significantly lower rCBF of ischemic lesions central area, the difference was statistically significant (P<0.05), different groups rCBF of the same basic consistent, there was no statistically significant difference (P>0.05), compared two groups of patients significantly lower rCBV ischemic lesions central area, the difference was statistically significant (P<0.05), of the same parts of different groups rCBV, there was no statistically significant difference (P>0.05), compared two groups of patients with the same parts of rCBV, there was no statistically significant difference (P>0.05), compared two groups of patients, a significantly lower rCBV ischemic lesions central area, the difference was statistically significant (P<0.05). Conclusion Low dose CT perfusion imaging, while effectively reduce the radiation dose, can effectively evaluate the blood flow in patients with lesions in, is of great significance for clinical treatment and prognosis of recovery.