The aims of the present study were to observe the immunosuppression effect of cyclophosphamide with different dosage regimen on mice and to explore the method for establishing immunosuppression model induced by cyclophosphamide in mice. Single or multiple doses of cyclophosphamide were intraperitoneally injected in mice. The immune organ index, serous level of alanine aminotransferase, aspartate aminotransferase, urea nitrogen and creatinine, blood leukocyte count, and splenic lymphocyte transformation were determined to evaluate the effect of cyclophosphamide on immunity and hepatic and renal function of mice. The results showed that both the multiple administration of 10, 20, 30, 40 mg/ (kg·BW) of cyclophosphamide for consecutive seven days respectively and single administration of 150 mg/ (kg·BW) of cyclophosphamide exhibited immunosuppression effect on mice and caused the changes of indicators associated with hepatic and renal function;the immunosuppression effect produced by multiple administration with lower dosage of cyclophosphamide was superior to that produced by single administration with higher dosage, and the immunosuppression effect was improved with the increase of dosage under multiple administration mode. The combined data suggest that the immunosuppression model in mice can be established by multiple administration of 30-40 mg/(kg·BW) of cyclophosphamide for consecutive seven days.%旨在观察不同剂量及不同给药方式下环磷酰胺对健康小鼠的免疫抑制作用，探索建立小鼠环磷酰胺免疫抑制模型的方法。采用腹腔注射法给予小鼠不同剂量的环磷酰胺，通过测定免疫器官指数，血清谷丙转氨酶、谷草转氨酶、尿素氮、肌酐含量，血液白细胞数量，脾淋巴细胞转化率等指标，评价环磷酰胺对小鼠机体免疫力以及肝肾功能的影响。结果表明，连续7 d分别给予小鼠腹腔注射10、20、30、40 mg/（kg·BW）的环磷酰胺和单次注射150 mg/（kg·BW）的环磷酰胺，均可对小鼠产生不同程度的免疫抑制作用，并引起肝肾功能相关指标的变化；低剂量多次注射环磷酰胺产生的免疫抑制效果优于高剂量单次注射，且在低剂量多次注射时，免疫抑制效果随注射剂量的升高而增强。连续7d给予健康小鼠腹腔注射30~40 mg/（kg·BW）的环磷酰胺，可建立小鼠免疫抑制模型。
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