Objective To assess the satisfaction of trainees with the 2024 large-scale online learning program within China's disease control and prevention system (CDC system), thus providing reference data for optimizing talent development within the CDC system.

Methods Data of satisfaction surveys were collected from 44 333 trainees across all levels of CDC institutions and related organizations nationwide who participated in the online training program from November 7 to December 15, 2024, via the National CDC Integrated Management Platform. The analysis focused on the drivers of participation, satisfaction with the training program, perceptions of learning outcomes and knowledge application, as well as the strengths of the learning platform and barriers affecting participation.

Results Among the 44 333 trainees participating in the CDC system's online learning program, 69.2% were motivated by enhancing their professional skills and competencies. Trainee satisfaction rates for course module design and recording, instructors, course contents, targeted thematic design, and course duration were 87.9%, 92.2%, 90.8%, 90.2%, and 84.7%, respectively. Among the trainees, 97.4% believed the online learning enhanced their understanding of professional knowledge and broadened their knowledge base, while 92.0% indicated the knowledge and skills acquired could be easily applied to their actual work. The primary strength of the CDC system's large-scale online learning platform was its abundant resources, whereas the lack of practical activities and opportunities for interaction constituted the main barriers affecting participant engagement.

Conclusions Trainees demonstrate high satisfaction with the CDC system's large-scale online learning program. The initiative achieved broad coverage of high-quality resources, though improvements are needed in course duration scheduling and teaching interactivity.