Objective:To analyze the predictors of poor outcomes after emergency intracerebral thrombectomy based on the characteristics of cerebral angiography.Methods:A total of 146 patients with acute ischemic stroke (AIS) who received endovascular treatment in Loudi Central Hospital from March 2019 to February 2022 were included in the study, and digital subtraction angiography (DSA) was performed on the patients. The patients were divided into a good prognosis group (95 cases) and a poor prognosis group (51 cases) by the modified Rankin scale 3 months after operation. Gender, age, time from onset to visit, time from onset to puncture, proportion of intravenous thrombolysis, occlusion site, treatment strategy, National Institute of Health Stroke Scale (NIHSS) score, core infarct volume, ischemic hypoperfusion volume, collateral circulation classification, and venous drainage status were compared between the two groups score; Logistic regression was used to analyze the risk factors affecting the poor prognosis of patients; Receive Operating Characteristic (ROC) curve was used to analyze the predictive value of collateral circulation classification and venous drainage status score for poor prognosis of patients, and the differences in general data and imaging data were compared between groups with different collateral circulation grades and venous drainage status.Results:Compared with the good outcome group, the time from onset to visit, NIHSS score, core infarct volume, ischemic hypoperfusion volume, the proportion of thrombectomy alone, and collateral circulation classification in the poor outcome group [2 (2, 3) levels. 2 (1, 2) level] and venous drainage score [5 (4, 6) points vs. 6 (6, 8) points] increased ( P<0.05), and the proportion of recanalization grade 2b/3 decreased ( P<0.05); NIHSS score, collateral circulation grade and venous drainage status were predictors of poor outcome within 3 months after mechanical thrombectomy ( OR = 2.51, 1.93, 2.61, P<0.05); collateral circulation grade and venous drainage score predicted mechanical thrombectomy in patients with AIS, the area under curve (AUC) of poor outcome after thrombectomy were 0.714 and 0.829, respectively; the time from onset to visit between patients with poor collateral circulation, moderate and good AIS [(236.95 ± 21.03) min, (250.41 ± 21.32) min, (255.72 ± 20.98 min)], core infarct volume [52 (17, 80) ml, 25 (15.5, 30) ml, 15 (10, 25) ml] and venous drainage scores [5 (4, 6) points, 5 (5, 8) points, 5 (5, 8) points] were significantly different ( P<0.05); time from onset to visit in patients with poor venous drainage, moderate and good AIS (234.81 ± 21.22 min), (256.83 ± 20.88) min, (258.97 ± 21.35) min], core infarct volume [17(13, 45) ml, 26(25, 29) ml, 20 (11, 29) ml] and collateral circulation classification [2 (1, 2) level, 2 (1, 3) level, 2 (2, 3) level] were significantly different ( P<0.05). Conclusions:Collateral grading and venous drainage scores based on DSA imaging were predictors of poor outcomes within 3 months of mechanical arterial thrombectomy in patients with AIS.