恶性肿瘤患者常有免疫力低下现象，而放射治疗由于通过抑制干扰素，降低了ＮＫ细胞活性，影响其疗效。本研究使用普通级Ｃ５７／ＢＬ荷瘤小鼠放疗合并中药《小柴胡汤》对ＮＫ细胞活性观察结果说明小柴胡汤联合照射后，特别是２０Ｇｙ照射组的ＮＫ细胞活性确明显升高（Ｐ＜０．０５）。同时也具有解除或缓解荷瘤小鼠的免疫抑制和放疗对机体免疫抑制作用，增强抗肿瘤效果 Patients with malignant tumors often have low immunity, and radiation therapy reduces the activity of NK cells by inhibiting interferon and affects its efficacy. In this study, the observation of the activity of NK cells by conventional C57/BL tumor-bearing mice combined with Xiao Chaihu Decoction showed that the activity of NK cells was significantly increased after Xiao Chai Hu Tang combined irradiation, especially in the 20 Gy irradiation group (P< 0.05). At the same time, it also has the effect of relieving or alleviating immunosuppression and radiotherapy of tumor-bearing mice on the body’s immune suppression and enhancing anti-tumor effects.