介绍了湿度常用表示方法和军品包装上常用的3种湿度显示方法，着重介绍了湿度显示卡在军品包装上的应用及其变色原理，简要分析了湿度显示卡在应用上的一些优缺点。通过对军品包装湿度控制的分析，以及其他2种湿度显示方法的工作原理和优缺点，提出了在军品包装上选用湿度显示方法时，应考虑因素的顺序。

Common humidity expressing methods and three kinds of humidity display methods for military packaging were introduced. The color changing principle of humidity display card and its application in military packaging was introduced emphatically. Advantages and disadvantages of humidity display card were analyzed. Based on analysis of military packaging humidity control, working principle and advantages and disadvantages of two other humidity display methods, the order of factor should be considered in humidity display methods selection for military packaging was put forward.