Cadets preparedness consist of Knowledge and Attitude (KA), Emergency Planning (EP), Warning System (WS), and Resource Mobilization Capacity (RMC) play an important role in facing tsunami disaster. The purpose of this research is to know cadet preparedness in facing tsunami disaster at Education and Training Center of Aceh Besar. This research type is descriptive explorative with cross sectional design. The research population is all of cadets in Education and Training Center of Aceh Besar that amounted to 241 cadets, sampling technique using purposive sampling, as many as 100 respondents, with data collection tools are in the form of questionnaires and types of questionnaire instruments. The research was conducted on May 02 until May 04, 2018 with the results of the research for the cadet preparedness were obtained 86,97 is categorized as highly prepared. Which the average of each parameter as follows: the average of knowledge and attitude of cadets (90%) of 87.45 are categorized as highly prepared, the average of emergency planing in cadets (84%) of 88.15 is categorized as highly prepared, the warning system in cadets (92%) of 89.70 is categorized as highly prepared, the average of Resource Mobilization Capacity at cadets (98%) of 93.50 is categorized as highly prepared. From the result of this research, it is expected that tsunami disaster preparedness training will be more intensely given to cadets.