The least-squares fitting of the observed energy levels to the Watson' s Hamiltonian con-stants of water vapor vibrational states (202), (122), and (004) had been performed. Using these constants and the revised quantum Fourier transformation (namely QFT*) method, we calculated the N2-broadened widths of the observed absorption lines for (202) band. Also we obtained the N2-broadening widths and temperature dependences of lines in the R(l ,1) branch of (202), (122), and (004) bands. The agreement between calculation and experiment show that the fitting to the Hamiltonian constants is reasonable and the QFT* method can be ap-plied to calculate the collision broadening of water voapor in the visible region. In addition, the calculated results indicated that in the visible region the collision broadening and line-width temperature dependence vary with the rotational and vibrational quantum numbers, and the maximum values of these two parameters might be two times as large as the corresponding minmum value.