Objective To explore the impact of restrictive fluid administration for patients with colorectal cancer combined diabetes. Methods The clinical data of patients diagnosed definitely as colorectal cancer with diabetes were analyzed retrospectively from January 2007 to October 2009 in this hospital, the clinical effects on postoperative early rehabilitation were studied and the differences between restrictive fluid regimen (fluid restriction group) and tradition fluid regimen (tradition therapy group) were compared. Results The time of first aerofluxus and the first ambulation in fluid restriction group were shorter than those of tradition therapy group, the differences had statistical significances (Plt;0.05). The incidence of wound infection in fluid restriction group was lower than that in tradition therapy group (Plt;0.05). The differences of preoperative hemoglobin (Hb), white blood cell (WBC), glucose (GLU) and blood urea nitrogen (BUN) were not statistically significant between two groups, but the difference of postoperative GLU was statistically significant between two groups (Plt;0.05). Conclusion Restrictive fluid regimen can reduce the incidence of common complications after colorectal surgery for diabetic, and has a certain promoter action to the early rehabilitation after rectal surgery.