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Objective To analyze the risk factor of postoperative urinary retention（POUR） in patients with colorectal malignant neoplasms. Method 527 patients，hospitalized fromOctober， 2013 to September， 2015 in the Second Affiliated Hospital of Kunming Medical University and diagnosed with colorectal malignant neoplasms， were divided into two groups depending on whether postoperative urinary retention occurs. Gender， age， preoperative complications，body mass index，preoperative hemoglobin，preoperative albumin，intraoperative circumstances，time for indwelling catheter after operation and length of stay were analyzed and compared between two groups. Results Compared with the group without postoperative urinary retention，the group with postoperative urinary retention was different in gender， urinary complications， body mass index≥30 kg/m2， with rectal malignant neoplasm， with low Anterior Resection or abdominoperineal Resection， with T4 stage and with operation time≥240 min，wich has have statistical significance（ P＜0.05）.Conclusion The male who have urinary system disease and whose body mass index is more than 30 kg/m2 are in high risk of postoperative urinary retention. Meanwhile rectal malignant neoplasm，with low Anterior Resection or abdominoperineal Resection，T4 stage tumor and operation time≥240 min are the high risk factors.Once postoperative urinary retention occured，the length of stay and the risk of urinary tract infections would increase. [ABSTRACT FROM AUTHOR]

Objective To evaluate the predictive value of Cr-POSSUM scoring systems in patients with rectal cancer after surgery. Methods 276 patients who underwent surgery with colorectal malignant neoplasms were divided into two groups depending on Cr-POSSUM total scores. Scores 17 points or less were defined as low-risk patients, scores more than 18 points were defined as a high-risk patients. The predicted results were compared with the actual situation by receiver-operating characteristic curve （ROC curve） and the ratio of expected mortality and obseved mortality to evaluate the accuracy. Results In the comparison of patients with high-risk group and low risk group， age， PS score， OS scores， postoperative bleeding and mortality in 30 day after surgery had a statistically significant difference（p P＜0.05） . Conclusion Cr - POSSUM can accurately predict the postoperative mortality of patients with rectal cancer. [ABSTRACT FROM AUTHOR]