This research aims to determine the signs of a natural disaster that may occur in Indonesia. Indonesia is a country that is very prone to natural disasters, for example, volcanoes and tsunamis, which caused by earthquakes under the sea. This research used a qualitative research method. The respondent involved in this research is several government agencies that are authorized for natural disasters in Indonesia. The results of this study show a high level of knowledge of early warning of natural disasters, especially in prone areas to natural disasters to reduce casualties when natural disasters occur. The comparison when an area does not have an early warning system to know the good and bad impacts. This study concludes that many people do not understand the code given when the natural disaster early warning device sounds. Besides, a lot of them do not understand the signs intended in natural disaster detection devices. Therefore, there is a need for socialization from the government so that people understand the warning technology early.