Communication is a fundamental part of healthcare. Poor communication is a common cause of medical complaints; the common and difficult communication often involves truth-telling and shared decision-making (SDM). Medical treatment can be emotionally distressing for patients; thus, understanding how to communicate with patients and treat patient emotional problems is paramount for providing quality healthcare. This study evaluates the effectiveness of learning SDM, truth-telling, patient emotional disturbance evaluation methods, and emotional processing of staff and patients. Fifth- and sixth-year medical students from Chang Gung University were recruited and administered a research questionnaire based on the COMRADE (Combined Outcome Measure for Risk Communication and Treatment Decision Making Effectiveness) Scale. The questionnaire was used in an online pre-training evaluation and post-training evaluations immediately and one month following training. The result shows that online instructional videos can facilitate students' learning of SDM, truth-telling, patient emotional disturbance evaluations, and emotional processing; students were highly satisfied with the online instructional videos. Their acceptance of SDM also increased. The online instructional video method facilitated both on-the-spot learning and later self-study, and demonstrated its effectiveness when face-to-face teaching is practically impossible. In the future, a self-test and feedback mechanism may be designed for online instructional video courses to enhance students' learning concentration and efficiency. The results of this study can serve as a reference for medical schools and relevant government agencies when integrating medical communication topics into the curriculum.