Abstarct: In the category of high-temperature ceramics, materials such as HfB2 have unique characteristics in terms of physical and mechanical properties, along with a high resistance to thermal shock. Therefore, these materials are considered suitable options for building structures that can withstand temperatures exceeding 2000 degrees Celsius. However, the high sintering temperature of these materials presents a challenge. To address this issue, it is essential to utilize oxide or carbide compounds as sintering aids.In this research, SiC and ZrC has been utilized as a sintering aid and the second reinforcing phase in the production of HfB2 parts using the SPS method.For more detailed research, samples containing 20% by weight of SiC and varying amounts of ZrC (zero, 10, 20 and 30% by weight) were sintered at a temperature of 1900°C for 15 minutes.In order to analyze the samples and microstructures, XRD tests, transmission electron microscopy (SEM) and EDS elemental analysis were conducted. Additionally, the Archimedes test was performed to determine the density of the samples.In the final step, the samples were oxidized for 5 hours at a temperature of 1500 °C and subsequently analyzed. The results of the tests indicated that the best hardness, flexural strength and density are related to sample containing 20% by weight of ZrC.The resistance mechanism of this composite relies on the formation of three oxidized laxyers such as HfO2, HfSiO4, and SiO2. Incorporating 10% by weight of ZrC into the HfB2 – SiC composite results in a higher oxidization resistance.However, an increased amount of ZrC Also Causes the composite to oxidize faster. By increasing the amount of ZrC by weight to 20%, we observe an increase in the porosity, density and hardness of the composites.The porosity of the initial sample decreases from 0.92% to 0.53%, Hardness increases from 23.33 Gpa to 27.44 Gpa, and the density rises from 98.5% to 99.15% in the composite. Additionally, increasing the ZrC to 20% by weight, decreases grain size and increases bending resistance from 425.16 Mpa to 483.42 Mpa.