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An apparent viscosity model of semi-solid A356 aluminum alloy has been developed and the software Castsoft6.0 coupled with the model has been used to simulate the mould filling of an automobile master brake cylinder with the semi-solid A356 alumi-num alloy slurry.The simulation results are in agreement with the practical filling process, indicating that the apparent viscosity model is feasible and can be used to simulate the mould filling of the semisolid A356 aluminum alloy slurry and can be used to opti-mize the filling process and the design of dies.A higher injection pressure, a higher ingate flow velocity of the semi-solid slurry, and a higher slurry temperature are advantageous to the mould filling of the automobile master brake cylinder.