Abstract: Aiming at the laser directed interference system ,which counteracts two kinds of detectors of 1 m~3 m and 3 m~5 m, needing two corresponding wavebands outputs,we used the high repetition rate driving Q-switched technology and the seed injection magnifying technology to acquire high-power good-quality 1.06 m fiber laser output, the exterior polarizer got two beams laser outputs, the periodically poled lithium tantalate (PPLT) and periodically poled lithium niobate (PPLN) crystals were pumped to get high-power 1 m~3 m and 3 m~5 m laser outputs. As the input current was 60A and the Q-switched frequency was 50 kHz ，the 2 m laser output was obtained with up to 7.5 W power as well as the 3.9 m laser with a 4.2 W max power, the conversion efficiency was 39.5%. Experiment results indicate that using the fiber laser pumped optical parametric oscillator(OPO), the high power 1~3 m and 3~5 m dual-band laser output can be got.