Due to the shortening of the length of compulsory military service, in order to enhance the quality of the military personnel, cultivate ahigh-tech armed forces, prevent the weakening of military capability, and deal withnew generation of war model, aforward-looking plan has thus been created. The Republic of China passed the "the review and improvement of the current military service system" on January 24, 2005, and decided to adopt the combination of voluntary service and conscription systems with main emphasis on voluntary service. Obviously, the quality of soldiers is crucial to achieve the goal of national defense. Therefore, this paper will investigate the influential factors with regard to the quality of volunteer soldiers, such as the psychological factors of soldiers, motivation to join the military, career planning, learning experiences, military environment, training resourc es, interactions among colleagues, welfare and benefits and leadership styles. Furthermore, recommendations with regard to the enhancement of soldier's quality will be made from those factors.