This is a multi-centered, prospective, observational study aimed at observing the Incidence Rate of Perioperiative VTE in Colorectal Cancer Patients

Inclusion Criteria:

• Patients in colorectal surgery ward Clinical diagnosis of colorectal cancer Prepare for radical colorectal surgery.

Exclusion Criteria:

• Patients prepare for emergency surgery Clinical diagnosis of benign colorectal disease Patients who have joined other clinic studys

Colorectal cancer patients prepare for radical colorectal surgery in colorectal surgery wards