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Various factors are known to be associated with quality of bowel preparation (QBP), but have rarely been investigated in patients with prior colorectal resection. The aim of this study was to investigate variables associated with bowel preparation in patients with prior colorectal resection.A total of 247 patients with prior colorectal resection and undergone surveillance colonoscopy were consecutively chosen. One clinician performed endoscopy for all patients. QBP was rated using Aronchick grade and was categorized as either satisfactory (Aronchick grades, 1 to 3) or unsatisfactory (Aronchick grades, 4 and 5). Factors associated with QBP were analyzed.Unsatisfactory bowel preparation was detected in 49 patients (19.8%). There was no difference in QBP on the basis of sex, age, body mass index, hypertension history, diabetes mellitus history, smoking habits, time after surgery, resected colon length, or bowel preparation method. Operation method was marginally associated with QBP (P=0.056). When we dichotomized patients into right-side colon preservation or not, the right colon preservation group showed a significant association with poor QBP on univariate (22.3% vs. 7.5%, P=0.028) and multivariate analysis (odds ratio, 3.6; 95% confidence interval, 1.0-12.3; P=0.038).Patients with a preserved right colon were associated with poor bowel preparations compared with patients who underwent right-side colon resection. When preparing patients with history of colorectal resection for colonoscopy, these differences should be considered for better bowel preparation.