A new method for fabricating microlens on the D-type optical fiber is proposed in this research. A scalar diffraction analysis is used to calculate the coupling efficiency. First, the negative photoresist SU-8 is used to fabricate Oval microchannel array and the thermal reflow method is used to get a convex lens mold. Next, The PDMS is used to transfer the mold shape to OG146 . By this method, we can improve the optical coupling efficiency between the laser and the D-type optical fiber mode.