The femtosecond laser has garnered extensive attention in the field of micro/nano fabrication owing to its superior processing quality. Although experimental observations have revealed the formation of recast layers caused by molten splashing during the femtosecond laser ablation of silicon carbide(SiC)， theoretical modeling regarding the underlying mechanisms remains scarce. In this study，an improved multiphysics-coupled predictive model combined with experimental characterization was employed to systematically investigate the evolution mechanism of molten flow on SiC ablation morphology under multi-pulse irradiation. The ablation threshold and its accumulation effect in SiC were examined. The pulse number and laser fluence were modulated systematically， revealing the dynamic cycle of material removal and redeposition induced by multi-pulse irradiation，which enables the fabrication of high-quality micro-holes using near-threshold fluence. Furthermore， simulation and experimental validation facilitated the optimization of pulse energy distribution， resulting in a significant enhancement of ablation efficiency.