This trial is a multicenter prospective cohort study to explore timing of colorectal cancer surgery after COVID-19 infection so that can assist clinicians and patients. Currently, there is less evidence on perioperative outcomes after COVID-19 vaccination and the omicron variant. Therefore, it is necessary to update previously published consensus which recommends that patients should avoid elective surgery within 7 weeks of COVID-19 infection remain, unless the benefits of doing so exceed the risk of waiting. Aiming at the above problems, we plan to carry out a multicenter prospective cohort study to develop perioperative management according patients' different conditions.

Inclusion Criteria:

• undergoing colorectal cancer surgery
• infected with COVID-19 but nucleic acid test result is negative
• the patients compliance is good
• signed the consents voluntarily

Exclusion Criteria:

• undergoing emergency surgery(intestinal obstruction, intestinal perforation, intestinal hemorrhage, et al.)
• The patients' situations which judged by situations is not suitable to participate in the clinical trial

Colorectal cancer patients undergoing surgery with perioperative COVID-19 infection.