Abstract:In order to simplify the interior ballistic model of Cased Telescoped Ammunition(CTA),divided the interior ballistic process into tow stages. Combined with the classical interior ballistic theory and the modern interior ballistic theory, established a mathematical model composed of igniter squid zero dimension model and one dimension two-phase flow interior ballistic model of Cased Telescoped Ammunition simulated by using the two-phase flow method and computational fluid dynamics, and was confirmed with MATLAB software, Showed the distribution in space after the shell of ballistic parameters, provided a new model creation method of analyzing interior ballistic performance of cased telescoped ammunition,provided important theoretical guidance for revising and optimizing the CTA gun charge structure.