Two-Color Laser-Induced-Grating Spectroscopy(TC-LIGS)is a newlydeveloped laser spectroscopic technique. This scheme offers the advantages of zerobackground detection,high special resolution and easy spectral edgnment. The secondharmonic output(532 nm)of a Nd:YAG laser is split into two pump beams of nearly equalintensity. These beams intersect at an angle of 2.73 degree and are directed into theIc sample cell. The interference of these beams preduces a sinusoidal distribution of an excited-state laser induced population grating and a ground state laser induced depletion grating in the iodine molecules. A narrow bandwidth dye laser is used as probe beam and directed to the laser induced gratings. The spectroscopic signal is collected along the direction of Bragg diffraction. By scanning the probe laser wavelength, 129 TC-LIG lines coupled between B and X states of iodine molecules are obtained in the 555.9~570.6 nm, 576.3~587.2 nm and 605.0~605.6 nm regions.