To quantificationally analyze the safety of fuze exploding interruption, based on integration of conventional calculation methods and measured results of detonation parameters, the method based on explosive force was used to calculate the detonation parameters and gas pressure of spreading gas product. The explosive force was studied and the covolume was modified, so that the algorithm is not only suitable for the density greater than 1 g/cm³, but also applicable to the density less than 1 g/cm³, detonation parameter calculation results and the measured maximum error of about 10%. The calculation method in this paper provides theoretic reference to the design of exploding interruption component design in fuze.