Purpose: The purpose of this study is to identify changes in knowledge, self-efficacy and anxiety achieved through the provision of video education on chemotherapy with a portable infusion pump to colorectal cancer patients. Methods: This study is a nonequivalent control group and non-synchronized design as a quasi-experimental study. Participants in this study were colorectal cancer patients who received chemotherapy with a portable infusion pump through an ambulatory care unit. For 48 subjects, the education was divided into printed materials and videos, and knowledge, self-efficacy, and anxiety were measured. Data were analyzed using independent t test, paired t-test, and Wilcoxon’s signed rank test. Results: In the video education group, knowledge (Z=-4.09, p<.001) and self-efficacy (Z=-2.72, p=.012) significantly increased after education, and anxiety significantly decreased after education (Z=2.24, p=.035). However, there was no difference in knowledge (t=0.09, p=.931), self-efficacy (t=1.22, p=.229), and anxiety (t=-1.16, p=.250) between the groups after education. Conclusion: To improve the quality of life of cancer patients, it is necessary to promote self-efficacy and reduce anxiety. The results of this study suggest that more diverse educational methods should be attempted to improve knowledge and self-efficacy and reduce anxiety in colorectal cancer patients.