The critical criteria of mushy zone length and bubble tip length for formation of regular pore structure in Gasar porous alloyhave been deduced through theoretical analysis and calculation to understand effects of mushy zone length and solidification rate of alloy on pore structure of Gasar multi-pore Cu-Cr alloy.The results reveal that both mushy zone length and solidification rate should be controlled in a proper values.With a given solidification rate

the mushy zone length should be smaller than the bubble tip length

while with a given alloy composition

when the solidification rate vis less than vmax

porous structure Cu-Cr alloy can be prepared successfully.