Abstract: Objective: To investigate the value of CT evaluation of peritoneal carcinoma index(CT-PCI) in the resectability of pseudomyxoma peritoneal(PMP). Methods: The preoperative and postoperative CT images of 57 patients with PMP confirmed by operation and pathology in the Department of Myxomatology of Aerospace Center Hospital from January 2019 to April 2020 were retrospectively analyzed. CT-PCI scores were performed, and the preoperative and postoperative CT-PCI scores were statistically analyzed, and the surgical resectability was evaluated by CT-PCI. Results: The regions with high preoperative CT-PCI scores were concentrated in 0-8 regions, with 0 region as the most significant and 9 ~ 12 regions as the lowest, the regions with the most significant postoperative changes were 0 region, followed by 7, 6 and 8 regions, with the smallest changes in 9 region. Conclusion: CT-PCI can determine the distribution and size of PMP tumors in the abdominal cavity before surgery, which provides an important basis for clinicians to estimate the resectability of lesions before surgery and more accurately predict the grading of postoperative tumor reduction surgery.