Abstract: As the core component of weapon systems, the internal structural quality of explosives is directly related to the reliability of weapon systems. Currently, CT technology has been used for the internal quality detection and evaluation of explosives, especially for the qualitative and quantitative analysis of internal cracks in explosives. However, the selection of different testing parameters can cause changes in the quality of CT images, directly affecting the accuracy of subsequent quantitative characterization. This paper achieved the goal of prefabricating standard size cracks inside explosive specimens by processing standard size grooves of different widths on the surface of explosive specimens and sticking them to explosive specimens of the same specifications. By changing the testing parameters and process conditions, the influence of different detection parameters on measurement accuracy was obtained, and the optimal testing parameters for CT measurement of crack width in explosive specimens (such as initiating explosives with a size less than 10 mm) were analyzed and discussed.