On the basis of construction of the mathematical model of vulcanization ratio and numerical calculation of crosslinking structure parameters and derivation of the control equation of temperature field, two-dimensional space is divided in the manner of triangular element, then the interpolating function is calculated. Thereafter, the calculation of the element variation and collectivity synthesis is done, and the procedures of the numerical simulation of vulcanization process are described in detail. Finally, the computer-aided engineering software of silicone rubber vulcanizing is designed. The rationality of the simulation theory is verified by hardness test and analytical test.