The ro-vibrational spectra of iodine molecule were studied extensively, nevertheless, the corresponding of hyperfine spectrum was few studied. In this paper, over 700 groups of stronger hyperfine transitions of iodine molecule were theoretically predicated to be available to diode laser frequency standard at 630 - 640 nm. According to theoretical predicated wavelength, we measured several groups of stronger transition hyperfine spectra with third derivative technique based on saturated absorption technique, in which three of them are reported in this paper. In the experiment, the S/N of the observed hyperfine spectra was from 70 to 400, which are available to be reference transitions for the visual diode laser frequency standard at red wavelength. Based on the high S/N of the new reference transition, the stabilization for the diode laser was performed with the above new observed hyperfine spectra. A preliminary iodine frequency stabilized tunable diode laser at new reference transitions was achieved with the frequency stability of 5 X 10-11. Besides, the reason that the transition of band of 8 - 4 is stronger than the band of 6 - 3 were explained by the calculation of their Frank-Conden Factors, and the rule for assignment of the hyperfine spectra of Iodine molecule was also studied.