In order to achieve the temperature zoning of certain type PBX kneader, the heat transfer effect of the kneader and the influence of temperature control system structure on the equilibrium temperature distribution of PBX is explored by finite element simulation software ProCAST. Result shows that the temperature control structure and distribution of kneader under the initial structure are irrational, resulting in low temperature, large temperature difference and uneven distribution of equilibrium temperature in the middle chamber. After the improvement, the equilibrium temperature is close to the ideal value with uniform distribution in the middle chamber of kneader. The temperature gradient in the transition zone becomes large, and the gradient direction is perpendicular to the central horizontal line, thus achieve the temperature zoning from 50℃to 60℃and then to 50℃in the horizontal direction.