Objective This paper is to anlysis clinical value of CT and enhanced CT in the diagnosis of peritoneal metastasis of abdominal tumor in order to improve the diagnosis level on diseases. Methods Eighty six patients admitted by the Hospital pathologically confirmed to suffer from peritoneal metastasis of abdominal tumor were selected as research subjects, who were divided into the control group and the observation group according to diagnostic methods, patients in the control group underwent CT diagnosis, and patients in the observation group underwent enhanced CT diagnosis, results of pathological diagnosis and diagnostic accuracy rates of two diagnosis way were compared. Results Diagnostic accuracy on patients in the observation group hit 93.0%, being significantly higher than that on patients in the control group at 58.1% (P<0.05). Detected minimum planted lesions hit (1.0-0.9) cm squared, significantly better than that of control group (1.0±0.9) cm2 (P<0.05), the differences were statistically significant. Conclusion Enhanced CT delivers high clinical value in the diagnosis of abdominal peritoneal tumor metastases when compared to that of CT, its location is more accurate, more information can be provided, especially it delivers more diagnostic rate on minor planted lesions, being worthy of wide application in clinical practices.