The authors propose approaches for computerized simulation of meshing of DCAPSBG (double circular-arc profile spiral bevel gear). Algorithms for TCA (Tooth Contact Analysis) computer programs were proposed. This paper presented the key contents and method of TCA computer programming. TCA is an effective tool for meshing analysis of the DCAPSBG, and it is the basis of load tooth contact analysis and finite element analysis. The proposed approach is based on the tooth profile characteristic of the DCAPSBG and developed by Visual Basic and MATLAB mixed programming method. In addition, this paper made TCA analysis and contact area check experiment on gear meshing, and the program had been verified by real examples. This provided an effective approach for the design of DCAPSBG.