In order to improve parts accuracy, a method of adding heat balance support (HBS) was proposed, and the detailed algorithm for generating HBS was developed. A number of experiments and a comparison between similar softwares, showed that the algorithm is efficient and feasible. Moreover, different features of HBS were studied for different kinds of materials, such as PS and nylon. The research findings indicate that automatically adding HBS can significantly improve the accuracy of the parts, and that the algorithm for generating HBS is efficient and precise. A number of experiments and a comparison among similar softwares, showed that the algorithm is efficient and feasible. The research results indicate that that adding adding HBS can significantly improve the accuracy of the parts, and that the algorithm for generating HBS is efficient and precise.