Foundry integral forming technology is helpful to fabricate large size and complex structure ceramic/metal composite components, which has important theoretical significance and application value. In this paper, based on the finite element method, the flow field of SiC ceramic /K4169 alloy composite castings during filling process, the thermal interaction between ceramic and metal, the generation and distribution characteristics of thermal stress and residual stress in the solidification process were investigated. The results show that unstable flow occurs at the inner gate during the filling process. The surface temperature of the ceramic rises sharply after contacting the metal liquid, and a temperature gradient of 20-30℃/mm is generated inside the ceramic. The casting thermal stress decreases first and then increases. And the residual stress is concentrated on the interface between the ceramic and the metal, and the greater stress is on the ceramic side. Futhermore, the peak value of the residual stress is 2-3mm away from the interface.