With the continuously deepening education reform, to realize effective teaching as much as possible, teaching quality improvement becomes the precondition of building a moderately prosperous society. At the same time, teaching informationization also requires teachers to pay attention to keeping abreast of the times, adopt multimedia means for teaching and improve teaching efficiency. As new teaching concepts and teaching methods are required in the new era, five-star teaching theory focusing on problem-solving and the consistency of the teaching process and the learning process provides theoretical guidance for curriculum design through four steps, activating original knowledge, displaying and demonstrating new knowledge, trying application exercise, and integrated mastery. The classroom teaching interactive response system (CIRS) which attaches great importance to the interactive feedback between teachers and students, strengthens students' participation in the classroom can have a real-time control of teaching progress and adjust the teaching content in real time. Combination of five-star teaching theory and CIRS has the optimum effect on improving effective teaching. With internal medicine teaching course as the example, the study conducted smartphone CIRS course teaching model based on 5-Star Instructional Model, carried out experiments, and evaluated the experiment results through questionnaire survey. Experiment results show that the teaching mode received students’ full recognition, improved students' internal medicine teaching course scores and achieved good teaching results.