||The COVID-19 pandemic will accelerate the shift toward multipolarity, and will have major long-term impacts on territorial security within the Indo-Pacific. In addition, COVID-19 is likely to have a long-term effect on risk evaluation in the Indo-Pacific states. Therefore, it is vital to oversee and execute remedial activities quickly and successfully, amid the COVID-19 pandemic. This paper proposes a national defense and military budget planning strategy. It applies a decision-making trial and evaluation laboratory linguistic data strategy for group decision-making, in order to collect group opinions and analyze the causal relationship of complicated social science issues in indistinct situations. These concepts are divided into causal and impact groups, to provide an improved understanding of the relationship among them, as well as making recommendations to improve their general execution. This paper employed the fuzzy DEMATEL method to analyze the model and considered suggestions as the key influencing factors in budget planning strategy. Through this well-constructed fuzzy DEMATEL approach our research results show that a proper operations strategy and management of both resource usage and task arrangement in accordance with policy making will accomplish excellent budget planning strategy results. The results reveal that the Mission Requirement is a major causal factor. The study can provide a successful national defense and military budget strategy assessment with satisfactory criteria that fit the decision-makers’ requirements, particularly when the assessment criteria are various and entwined. We offer recommendations for government authorities to plan national defense and military budget planning strategies.