Inclusion Criteria:  ASA<3 classification 18kg/m2≤BMI≤30kg/m2 Neoplasm staging is T1-4a, N0-2, M0 No previous history of abdominal surgery No previous history of neoplasm chemoradiotherapy No status of ileus, bowel obstruction and active hemorrhage of the digestive tract  Exclusion Criteria:  Age<18 years or >75 years ASA≥3 classification BMI<18kg/m2 or BMI>30kg/m2 Neoplasm staging is T4b or M1 Underwent chemoradiotherapy Appeared status of ileus,bowel perforation or active hemorrhage of digestive tract Patients with pregnant