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Pursuing new insensitive high explosive (IHE) is the main research hot-point in explosive field. Nitroimidazole compounds were mainly studied in the medicine chemistry in the past[1-2], seldom seen as the components of explosives and propellants. But now, several nitroimidazole compounds, such as 2, 4-dinitroimidazole (2, 4-DNI), 2, 4, 5-trinitroimidazole (2, 4, 5-TNI) and 1-methyl-2, 4, 5-trinitroimidazole (MTNI) etc are found to be the important intermediates of synthesizing new high explosives or itself possessing excellent explosive performances[3-5]. This paper introduces the synthesis, especially the experimental thermal stability, sensitivity and security of 2, 4-dinitroimidazole (2, 4-DNI).