According to the latest Ministry of Education in 2014, to promote service learning programs to promote the process for the period, to start January 2014 until 31,December 2016.Service learning institutions in the country have been implemented a long time, and a lot of success stories,. The main are focus on the promotion of the concepts of service learning , promoting the establishment of cooperation networks , to gain experience heritages, international standards, formulate policies to promote the implementation and school service-learning will also promote community activities into one, but the military academies are to promote service-learning courses , because the school property is different. So you must take into account in promoting the deployment of service-learning subjects, technical subjects and combat skills courses overall curriculums. Therefore, this study by the National Defense University students hope to explore service learning participation, to find out the related factors affecting student willing to participate in service learning. Construction of system dynamics methods are through a system dynamic model to identify factors that affect the National Defense University students to participate in service learning and ways to improve the wills , with a positive growth experience to participate in bringing to continue to invest in social services, active participation Social Affairs , and students civic awareness ,responsibility , conservation ethics moral attitude and spirit of services.