Objective To establish and investigate C57 BL/6 mice model of radiation induced heart injury and ser-um marker. Methods Twenty eight female C57BL/6 mice were randomly divided into 3 groups:normal group (n=4 ) , 18 Gy radiation therapy group ( n=12 ) , 25 Gy radiation therapy group ( n=12 ) . The mice were weighed every week. Respectively, 0, 8 and 16 weeks after irradiation, the pathological changes of myocardial tissue were observed by hemetoxylin-eosin( HE) staining and made pathological score. Inferior vena cava blood was collected to take cardiac troponin I ( cTnI) test. Results Compared with the normal group,the weight of radiation group went down first then went up slowly. The myocardial tissue from mice had obvious histopathological changes. Acute in-flammation was the main change in the early days. At the late stage, progressive fibrosis was the main characteris-tic. With the increase of the dose, the inflammatory reaction and fibrosis degree had aggravated, pathological chan-ges had occurred earlier. cTnI showed a trend of higher performance over time, and had a correlation with patholo-gy. Conclusion We successfully established radiation induced myocaridal injury model. As a noninvasive serum marker, cTnI can be used as the evaluation standard of radiation induced myocardial injury animal model.%目的：探讨放射性心脏损伤动物模型建立方法和相关血清标志物。方法雌性C57BL/6小鼠28只,随机分为3组：对照组(4只),18 Gy放疗组(12只),25 Gy放疗组(12只)。每周测小鼠体重,分别于照射后第0、8、16周,取心肌组织行HE染色,观察心脏病理组织改变并进行评分；采集下腔静脉血检测心肌肌钙蛋白I ( cTnI)。结果与对照组比较,放疗组小鼠的体重开始呈下降趋势后缓慢上升。放疗组小鼠的心肌组织存在明显的组织病理学改变,早期以急性炎症为主,后期以进行性纤维化为特征；随着受照剂量的增加,炎性反应和纤维化程度加重,病变时间提前。 cTnI随时间变化呈升高趋势,和剂量大小、病理学表现均呈相关性。结论成功建立放射性心脏损伤动物模型。 cTnI可作为评价心脏损伤动物模型的无创性指标。
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