Abstract: The rapid prototyping technology of 3D printing is becoming more and more mature, and its application scope is more and more extensive. Silicon carbide material has excellent physical properties such as high elastic modulus, specific stiffness and good stability. In order to make the main bearing structure of remote sensing camera break through the limitations of traditional technology and design ideas, improve the light weight and obtain better mechanical and thermal stability, the silicon carbide as raw material was used and 3D printing manufacturing method was adopted to develop the main bearing structure. Firstly, the advantages and characteristics of silicon carbide 3D printing technology were introduced. Then, according to the technical characteristics, the design method of the main bearing structure was combed. Then, according to the design method, structural design, simulation and optimization were carried out. Finally, the outer envelope of the main bearing structure was 400 mm×370 mm×430 mm, the first-order frequency was 639.9 Hz, and the weight was only 4.2 kg, which was 41.6% lower than the traditional scheme. It has good mechanical and thermal stability and meets the use requirements. After mechanical test, it meets the design expectation.