Several years after the initial usage of continuous ambulatory peritoneal dialysis (CAPD), the percentage of patients using this continues to be very low constituting about 15% of all patients with end-stage renal disease (ESRD). In this study, we attempt to define the impact of an educational program for improving the use of CAPD. This is a quasi-experimental study (before-after) conducted with educational materials including workshop, teaching by booklet and showing educational films, performed in Urmia, Iran. We designed a questionnaire for data collection and enrolled 160 patients with an aim-based sampling method. We used descriptive statistics and Friedman test for analysis in SPSS software version 11.5. The overall patients' information about CAPD defined by total scoring was as follows: 75% had little information; 19% had moderate information and 6% of patients were well informed. All the information levels increased after intervention. Our study suggests that the poor utilization of CAPD is due to relative un-awareness about PD and/or lack of adequate facilities.