In order to understand the effects of the common cations in geofluids on the structure of water, the present paper systematically studied the Raman spectra of NaCl-H2O, CaCl2-H2O, MgCl2-H2O, CuCl2-H2O, ZnCl2-H2O and FeCl3-H2O solutions by two methods. (1) The frequency shifts of the peak maximum around 3 400 cm^-1 in O-H stretching Raman spectra of water reveal the destruction effects of these cations on the structure of water： Ca^2+〉Mg^2+ 〉Na^+, Fe^3+ 〉Zn^2+ 〉 Cu^2+ ; (2) Comparing the intensities of the shoulder peak around 3 250 cm^-1 in the O-H stretching Raman spectra of water. (1) all salts concerned destruct the structure of water; (2)with respect to the same chloride, the destruction extent of hydrogen-bond increases with concentration increasing; (3) comparing different chloride solutions at the same concentration, the destruction effects of catnions on the structure of water decrease in the sequences Ca^2+ 〉Mg^2+〉Na^+ and Fe^3+ 〉Zn^2+ 〉Cu^2+. (4)A hydrogen bond-affected mechanism combining cation destruction with complex compound production is supposed for the first time, and is used to explain the effects of the canions on the structure of water： CaCl2 〉MgCl2 〉FeCl3 〉NaCl〉ZnCl2 〉CuCl2.