Objective: To study the effect of Yiqi Bushen Koufuye (益气补肾口服液Oral Liquid for Invigorating Qi and Tonifying the Kidney) combined with chemotherapy on postoperative metastasis of stomach cancer. Methods: The 47 eases of postoperative stomach cancer with the syndrome of deficiency of both the spleen and kidney were divided randomly into the treatment group (28 cases), and the control group (19 cases). The control group was treated simply by chemotherapy; while the treatment group, was treated with Yiqi Bushen Koufuye in addition to chemotherapy. The effect was observed 12 months later on local relapse and distal metastasis, the life quality, peripheral hemogram, and immunologic function. Results: The rates of postoperative relapse and metastasis of the treatment group were obviously lower than those of the control group (P<0.05). The Kofasky scores, peripheral hemogram and immunologic function of the treatment group were obviously improved in comparison with the control group (P<0.01 or P<0.05). Conclusion: Yiqi Bushen Koufuye combined with chemotherapy is effective in preventing postoperative metastasis of stomach cancer, increasing sensitivity and decreasing toxins, and improving the life quality and immunologic function of the patient.