Abstract： Objective： To observe the effect of umbilical moxibustion on Junxia Zhushui prescription assisting the treatment of malignant ascites. Methods： A total of 90 cases of patients with malignant tumors complicated with malignant ascites were randomly divided into the control group and the experiment group. Both groups were intervened with routine treatment and nursing for malignant ascites；the control group was given umbilical moxibustion on placebo，and the experiment group was treated with umbilical moxibustion on Junxia Zhushui prescription. Both groups were treated for one course， with 12 times of treatment being a course. Before and after treatment， the abdominal circumference， depth of ascites under B ultrasound，24-hour inflow and outflow and Chinese medicine syndrome scores were measured， and the indexes in blood routine and liver and kidney function were detected. After treatment，the curative effects of improvement in Chinese medicine syndromes and ascites in the two groups were compared. Results： After one course of treatment， the total effective rate of improvement in Chinese medicine syndromes and the stability ratio of improvement in ascites in the experiment group were higher than those in the control group， differences being significant(P＜0.01， P＜0.05). After treatment， The abdominal circumference values in the experiment group was decreased than that in the control group(P＜0.05)；there was significant difference being found in the comparison of abdominal circumference values between the two groups(P＜0.05). During treatment， the ascites volume ascites in the control group showed an increasing trend. After the 8th day of treatment， the discharge in the experiment group was increased significantly，and the effect of ascites disappearance was better than that in the control group. The score of abdominal pain， defecation and urination in the experiment group were decreased when compared with those before treatment， differences being significant(P＜0.05). The scores of abdominal pain， mental state，defecation and urination in the experiment group were lower than those in the control group，the difference being significant(P＜0.05). There was no significant difference being found in the comparison of the safety test indexes between the two groups(P＞0.05). Conclusion：On the basis of routine treatment and nursing measures，the additional treatment of umbilical moxibustion on Junxia Zhushui prescription for malignant ascites can help delay the production of ascites and even reduce ascites，improve the symptoms of abdominal pain，and accelerate the regression of ascites through the smooth discharge of defecation and urination， so as to improve the mental state of patients， with good safety in the short- term treatment period.