Abstract: Two-dimensional random distribution models of SiC/Al and hybrid reinforced SiC/Gr/Al composites were established by using COMSOL finite element software and the effect of the second reinforcing phase graphite (Gr) on the thermal residual stress of SiC/Gr/Al composites was studied. The results show that the maximum thermal residual stresses of SiC/Al and SiC/Gr/Al composites are concentrated at the interface between SiC particles and aluminum matrix, and at the interface between the tip of flake graphite and aluminum matrix, respectively. After adding 5vol% Gr into 40% SiC/Al composites, the average residual stress of the composites decreases, mainly due to the weak interface binding of graphite and the aluminum matrix relaxing part of the thermal stress. The maximum residual stress of SiC/Gr/Al composites decreases firstly and then changes slowly with the increase of size of Gr, and the average residual stress changes little. The maximum residual stress of SiC/Gr/Al composites firstly increases and then changes slowly with the increase of the volume fraction of the Gr, and the average residual stress shows a downward trend.