Based on the research on the solidification of twin-roll continuous casting aluminum alloy thin strip, the analytical model of heterogeneous nucleation, the growth kinetics of tip (KGT) and columnar dendrite transformation to equiaxed dendrite (CET) of twin-roll continuous casting aluminum alloy thin strip solidification are established by means of the principle of metal solidification. Meantime based on the cellular automaton(CA), the emulational model of twin-roll continuous casting aluminum alloy thin strip solidification is established. The foundation for the emulational simulation of twin-roll continuous casting thin strip solidification structure is laid. Last, the numerical simulation can provide some theoretical guidance for twin-roll continuous casting thin strip. Meanwhile it has confirmed the mathematical simulation feasibility by the solidification process of twin-roll continuous casting aluminum alloy thin strip