Abstract: This study focuses on the regulatory mechanism of mechanical vibration field parameters on the solidification behavior of AlSi7Mg aluminum alloy foam vanishing mold precision castings. The dynamic effects of vibration frequency on the α-Al dendrite evolution, eutectic Si morphology reconstruction and fracture mode transition were systematically analyzed. The experimental results indicate that external mechanical vibration induces melt dynamic feeding, triggering a transition of α-Al primary phase from coarse dendrites to equiaxed grains, while the eutectic Si particles evolve from flaky to rod-like. At 100Hz, the tensile strength increases to 199.82 MPa, the elongation increases to 3.32%, achieving strength-ductility synergy. Vibration treatment promotes the transition of the fracture mechanism of tensile specimen from intergranular brittle fracture to transgranular dimple fracture, with a significant increase in the density of grain boundary slip bands.