This study aims to assist preschools in achieving sustainable development by providing system thinking training for teachers and administrators. By promoting system thinking and PDCA, training helps preschool staff and teachers construct their knowledge and culture for organizational growth and effective operation. The research procedure encompasses stages of preparation, knowledge diffusion, knowledge adaptation, and establishing support networks. A total of 744 training participants engage in case studies, discussions, and self-evaluation activities to enhance their understanding and application of the PDCA framework. Quantitative and qualitative methods are used to collect the research participants' perceptions and intentions on this training. Research data is collected using 5-point Likert questionnaires, supplemented with open-ended questions to gather participants' perceptions and suggestions. In addition, qualitative data is obtained through onsite observation, focus groups, and individual interviews. The research results indicate that participants in the training program positively perceive the training activities. Also, those with administrative roles and from non-profit preschools exhibit higher interest and motivation for training, reflecting the need for sustainability knowledge in changing environments.