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In this research, thermodynamic and phase analysis of SiC-Nano/microB4C composites with different weight percentages of secondary phase including 0, 0.5, 1, and 2 wt% -nano /microB4C made by pressureless sintering method have been investigated. To this end, 0 and 1 wt% phenolic resin were added to the samples separately as a carbon source (both as a binder and as a carbon additive), respectively. The resulting compounds were milled by a planetary ball mill for 3 h at a speed of 200 rpm. The initial pressing of the samples was performed at 50 MPa and the samples were subjected to pyrolysis at 600 °C. They were then sintered at 2150 °C for 2 h under an argon atmosphere. The results showed that the composite contained SiC-0.5 wt% -nanoB4C with the main peak intensity (2θ = 35.58) in phasic analysis using XRD pattern of more than 15,000 units and FWHM equal to 0.0036 which shows that the structure is smaller than the additive mode (FWHM = 0.2210) SiC-0.5 wt% -microB4C. Also, the results of phase analysis using the XRD model show that the use of NanoB4C increases the peak intensity in the phase analysis graph compared to the MicroB4C additive mode. In addition, increasing the wt% -nanoB4C increases the amount of graphitization.