To study the speciality of the interior ballistic for 35mm antiaircraft artillery with deterred-propellant, the mathematic model was established combining with the burning rule of 8/1 deterred-propellant to describe the 35 mm antiaircraft projectile's motion in the bore Runge-Kutta methods was use to program by Matlab software. The simulation result consisted with the experiment which come from referrence well. The model was computed respectively with different desensitizer content, The result showed that the desensitizer content of the deterred-propellant influenced on the speciality of the interior ballistic intensively. The little decrease of the desensitizer content could result in the maximal pressure in the bore rising rapid. When the inhibitor is disabled, the maximal pressure was 479 MPa, increased 35.54%,so the invalidation of the desensitizer effect shoot satfy badly, and it would threaten the security of the antiaircraft.