Abstract: The compression deformation process of the semi-solid alloy ZL201 and the influence of its strain rate and deformation extent/temperature on the thixoforming stress were investigated on the Gleeble-1500 thermo-simulator. It was revealed that the higher the deformation temperature, the lower the thixoforming stress of specimens at the same strain rate. On the other hand, if the deformation temperature remains unchanged and the strain rate Ε˙<5 s^-1, the higher the strain rates, the higher the thixoforming stress. And if Ε˙>5 s^-1, the thixoforming stress tends to decrease with increasing strain rate. The results can provide the basic data for the optimization of process parameters of semi-solid metals.