The paper introduces a way that uses telescope for increasing the coupling efficiency of the fiber. It aims at that to those low coupling efficiency system, proper telescope can increase coupling efficiency greatly. To the laser TA 100, the telescope of 1.6:1 makes the coupling efficiency of single mode fiber reach to 70%, and which of polarization maintaining single mode fiber reach to 67%. The paper also introduces how the distance of two lenses affects the coupling efficiency in experiments, how to select the telescope, and the fiber couplings of other lasers.