Abstract: Converting a continuous CAD model into a high quality discrete triangular mesh is a practical problem in industrial product design process. For this problem, a triangular mesh optimization for CAD model based on the Creo secondary development platform and geometric feature-preserving is proposed. Based on the secondary development platform of Creo, the feature point set of a CAD model was first constructed, and then a triangular mesh of the CAD model was constructed surface by surface based on the feature point set. The initial mesh was obtained after triangular mesh approximation. At last, combined with the geometric features of CAD model, the applicability conditions for local operator of RAR mesh optimization algorithm were improved, and an optimized triangular mesh was obtained using the improved algorithm. The proposed algorithm was integrated into Creo 2.0 software. The CAD model of three industrial parts was used as experimental data. The experimental results showed that the initial mesh model approaches accurately with the original geometric model, and the optimized mesh has better performance parameters.