Three typical cases about technology transformation on counterflow regeneration fixedbed were summarized.The analysis shows that:counterflow regeneration fixed-bed with gas pressure on the top is always used in the fixed-bed with diameter larger than 2.2m;no top-pressure regeneration fixed-bed is only fit for influent with low salt content and bed with diameter smaller than 2.2m.Cation double chamber bed is fit for influent in which the molar ratio of carbonate hardness to total cations is above 30%.High-velocity double chamber bed is fit for influent with low salt content.