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目的 研究和分析螺旋CT三维重建对孤立性肺结节（SPN）良恶性的诊断价值。方法 本研究选择性回顾了2017年10月至2020年3月期间在本院进行了孤立性肺结节治疗的80例患者资料，所有的患者均经过检查并已确诊。对患者的胸部CT三维重建和常规胸部CT平扫方式进行诊断，对比两组患者良恶性诊断情况及胸部CT平扫和胸部CT三维重建在SPN鉴别方面的情况。结果 80例患者经过胸部CT扫描后均诊断为SPN症状，其中患者结节直径平均值为（0.67±0.48）cm，其中应用胸部CT三维重建诊断的SPN患者有50例，此外还“,”Objective To study and analyze the value of three-dimensional reconstruction of spiral CT in the diagnosis of benign and malignant solitary pulmonary nodules (SPN). Methods This study selectively reviewed the data of 80 patients treated with solitary pulmonary nodules in the hospital from October 2017 to March 2020. All patients were examined and diagnosed. In this paper， the patients were diagnosed with three-dimensional CT reconstruction and conventional CT scan. The positive and malignant diagnosis were compared with the three dimensional CT reconstruction in SPN. Results Eighty patients were diagnosed with SPN symptoms after chest CT scan， of which the average diameter of the patient\'s nodules was (0.67±0.48)cm， and 50 patients with SPN were diagnosed with three-dimensional reconstruction of chest CT. In addition， 3 patients were found to have nodule lesions in the cross section of the chest CT reconstruction and specific diagnosis， but no nodule lesions were formed on the sagittal and coronal surfaces. Of the 50 patients， 27 were malignant and 23 were benign. In benign SPN patients， the detection probability of normal chest CT scan SPN was 0， the detection probability of Burr was 26.09%， the detection probability of angiosis was 30.43%， and the detection probability of malignant patients was 25.93%. The detection probability is 66.67%. The detection probability of angiosis is 55.56%. The detection probability of split leaves in patients with three-dimensional CT reconstruction of chest SPN is 0， the detection probability of Burr is 0， the detection probability of angiosis is 13.04%， the detection probability of leaf division in malignant patients is 14.81%， and the detection probability of burr is 100.00%. The detection probability is 100.00%， and the detection probability of angiosis is 100.0%. The comparison of project data is statistically significant(P＜0.05). Conclusion In the diagnosis of solitary pulmonary nodules， the threedimensionalreconstruction of spiral CT has a certain practical value. The accurate probability is relatively high in the diagnosis of solitary pulmonary nodules， but there are still some pathological changes. The situation cannot be completely resolved. It may even lead to misdiagnosis. If clinicians want to better improve the probability of diagnosis， they must organically combine enhancement and perfusion to improve the probability of accuracy.