We report a case in which chemotherapy with paclitaxel (TXL) infused systemically and intraperitoneally was effective for gastric cancer with malignant ascites. A 69-year-old man suffering from advanced gastric cancer with peritoneal dissemination underwent distal gastrectomy, a radical C operation. After chemotherapy with TS-1 and low-dose CDDP, TS-1 was administrated on an outpatient basis for 6 months. However, he complained of abdominal fullness and ascites, and received combination chemotherapy with paclitaxel infused systemically and intraperitoneally as second-line treatment. The ascites completely disappeared 5 weeks after administration. The only toxic event was anemia (grade 1), and no major adverse effects were observed.