Weichangan is traditional Chinese medicine prescription and has played an important role in the treatment with gastric cancer.The clinical study finds that Weichangan has good curative effect on advanced gastric cancer.It is confirmed by a large number of clinical data that herbal medicine which has the function of tonifying the spleen that Weichangan can increase life time of gastric cancer patients,improve the quality of life and reduce the rate of postoperative metastasis.The experimental results shows that the Weichangan inhibits gastric cancer cell invasion and metastasis,epithelial mesenchymal transition and the proliferation of gastric cancer cells,induces apoptosis and regulates immunity.Thus Weichangan has a good curative effect in the treatment of gastric cancer.