民主政治中，民眾對於政府的信任與支持，是政治穩定與政府施政的基礎，因此政治信任 與政治支持是政治傳播學者經常關注的研究議題。然而，軍隊是政府的一環，但是過去的研究 中並未關注民眾對軍隊的信任與國防的支持。鑑此，本研究運用「世界價值觀調查」（World Values Survey)的次級量化資料，分析我國民眾在1995年與2006年對於軍隊信任與國防支持 的歷時性變化。研究發現，民眾對軍隊的信任和整體政府的信任有逐年下滑的趨勢，但與其他 政治機構相比，軍隊的信任程度仍名列前茅。而在國防支持度上，由於整體的民意偏重經濟發 展，國防的支持大幅下降。此外，民眾的軍隊信任是預測國防支持的重要變數。說明在政治、 經濟、社會等大環境難以改變的處境下，若希望民眾增加對國防的支持態度，積極爭取民眾對 軍隊的信任是值得努力的方向。

Public's trust and support for the government is the basis for political stability and government administration in any democratic countries. Therefore, both political trust and support are the main issues in the political communication research. Although the military is part of the government, previous studies have yet to concern the relationship of military reliability and support for the national defense. For this reason, the secondary data from "World Values Survey" was applied to analyze the change of military reliability and support for national defense in 1995 and 2006. The result revealed that public’s trust in military and central government has been in the downward trend. However, the trust in military still has higher respect when it compared with other political institutions. In addition, public opinion in support of national defense has dropped significantly due to an overemphasis on economic development issues. To sum up, military reliability is the significant explanatory variable for support of national defense. If the government wants to gain people’s support in national defense, earning people’s trust in military would play a crucial role.