Abstract: Tristructural-isotropic (TRISO) coated fuel particle which can contain most gas and solid fission products within the coating layers provides the crucial safety of high temperature gas-cooled reactor (HTGR). To meet the requirements of very high temperature gas-cooled reactor (VHTR), which will be operated in higher temperatures with deeper burnups, two novel types of SiC-based coated fuel particles were designed. The porous silicon carbide layer is used to replace the PyC buffer layer in the first type. The coating layers from inside to outside are inner porous SiC layer, inner dense PyC layer, dense SiC layer and outer dense PyC layer, respectively. The second type is the coated particle with different SiC coating layers, and the coating layer sequences from inside to outside are inner porous SiC layer, SiC transition layer and outer dense SiC layer, respectively. The novel particle design can reduce the internal pressure of coated fuel particle which can further reduce the probability of pressure vessel failure by introducing the porous SiC inner layer. The formation mechanism and preparation parameters of the porous SiC layer were investigated. The two novel coated particles with designed coating layers were successfully prepared by a fluidized bed chemical vapor deposition method. Moreover, the novel SiC-based fuel element concept was also provided, and two types of fuel elements with spherical and columnar shapes were fabricated using surrogate coated particles.