Abstract: According to ITU proposal,microwave link is used to Ka band,the scheme of transparence transmitting microwave signal over laser link was designed,including direct modulation transmission and microwave frequency conversion transmission.The basic conditions of realizing the goal are indicated:light source of the transmitter is diode pumped solid-state laser (DPSSL) with high power and good quality of beams,and the optimum driver of the transmitter is a broadband LiNbO3 optical waveguide modulator.