Cooling slope casting (CSC) is the simplest and cheapest method that is used to produce non-dendritic feedstocks for thixoforming technology. In the present investigation, the effect of pouring temperature and the type of the mould and cooling slope plate on the formation of fine and globular microstructure of A356 Aluminum alloy was studied. Molten A356 alloy with temperatures of 630 °C, 650 °C and 670 °C was poured on the surface of inclined plates then casted in the mould. The inclined plates and moulds are made from different materials, typically, low carbon steel, 304 stainless steel and pure copper. The analysis of variance (ANOVA) statistical technique was carried out to specify the most significance parameter that affect the microstructure of the produced feedstocks.