The distortion behavior and distortion controlling processes of PIM tungsten based heavy alloys were studied in this paper. Liquid phase sintering distorts the samples due to the large difference in density between W phase and liquid phase. The two step sintering process can effectively decrease the distortion of the alloys with higher tungsten contents. For the alloy with low tungsten contents, the powder mixture can decrease the sintering temperature of the alloy for full densification with good mechanical properties.