The explosive composition B is an old explosive. It was developed by Britishers during World War I and World War II. It was also used by the United States in World War II. The differential scanning calorimetry (DSC) curves of mixtures that of the explosive composition B show a significant change in recent manufacture batches. In order to understand the effect of the mixtures on DSC data, the thermal behaviors and safety characteristics were reevaluated in this work.