When a CW tunable dye laser beam with a linewidth of 6 MHz and a divergence of 4.7 x 10-3 radian irradiated across a Li atomic beam at right angle and scanned at the 30 Q Hz range, we recorded the fine and hyperfine structure of the transitions. Fine splittings in 22P terms of 6Li and 7Li have been measured to be 9.7+0.4 GHz and 10.5+0.5 GHz, respectively, and the isotope shift of 22P1/2 term being 10.7 + 0.6 GHz. With a scanning range of 2.5 GHz, spacinga of the successive lines of 7Li 22P1/2-22Si/2 transitions have been measured to be 88+llMHz, 730 + 73MHz and 92+7MHz, respectively. With a laser intensity of 4mW/cm2 and the oven temperature of 460C, the recorded linewidth was about 22 MHz. A number of factors affecting the linewidth, the relative strength of lines and the accuracy of measurement are discussed.