Objective This paper is to look into the value of enhanced CT for clinical diagnosis of peritoneal metastasis of abdominal tumor. Methods Sixty patients with abdominal tumor metastasis admitted in CT Room, Division of Image of the Hospital from January, 2014 to April, 2015 were selected, and these patients were divided into two groups according to different diagnostic methods (enhanced CT scan) and the control group (conventional CT scan), surgical pathology results were referred, and the diagnostic accuracy, the area of minimum planted lesion and incidence of adverse reactions of two groups of patients were compared. Results The diagnostic accuracy of patients in the observation group was 93.33%, being higher than that of patients in the control group (83.33%)(P<0.05). Minimum area of planting lesions of patients in the observation group hit (1.00×0.70) mm2 , being lower than that of patients in he control group at (2.72×1.80) mm2 , average width and length of planting lesions of patients in the observation group were less than those of patients in the control group (P<0.05). There comparison difference in the incidence of adverse reactions on patients in the observation group (3.33%) and that on patients in the control group (0.00%) was not significant, P>0.05. Conclusions Enhanced CT delivers the following advantages in clinical diagnosis of abdominal peritoneal metastasis tumor: Higher sensitivity is imposed on small-size planting lesions, significantly improving the diagnostic accuracy. Enhanced CT is provided with low incidence of adverse reactions and high safety.