Dicalcium silicate(β C2S) was prepared at 1350℃, and effect of sodium ions on its carbonation products was examined by X ray diffraction(XRD), simultaneous thermal analysis(TG DTA), Fourier transform infrared spectrometer(FTIR) and scanning electron microscopy energy dispersive spectrometer(SEM EDS). Moreover, to explore the feasibility of using the carbonation products of β C2S to solidify the soluble sodium ions, the soluble sodium ions concentrations in the sample suspension before and after carbonation were also monitored. The results indicate that the sodium ions have significant effect on the structure of β C2S carbonation products, but they do not affect the carbonation degree of β C2S. In the presence of sodium ions, the calcium carbonate formed during carbonation is mainly crystalline vaterite and polymerization degree of silica gels is unaltered. In turn, the soluble sodium ions concentrations after carbonation are decreased substantially. Sodium ions can be solidified in the vaterite crystals, which also result in the stable existence of the vaterite crystals.