In the process of selective laser melting (SLM), materials undergo rapid melting and solidification, and improper selection of process parameters may lead to defects in the fuse. In this study, the fusible characteristics of CuCrZr alloy in a single-layer single-pass SLM process with different process parameters were studied by numerical simulation and experimental verification at the microscale. The results show that the morphology of the molten pool is affected by the change in laser power and scanning rate during single-pass printing. When the laser power increases from 250 W to 450 W, the width of the fuse gradually increases to 124 μm, and ripples appear on the surface of the fuse. When the scanning rate increases from 0.4 m/s to 0.8 m/s, the width of the fuse gradually decreases, and the ripple morphology disappears. When the laser power is 250 W and the scanning rate is 0.8 m/s, the laser energy input is insufficient, resulting in spheroidization of the fuse. However, with increasing laser power, the spheroidization phenomenon disappears, and the metal powder particles locally melt at the edge of the fuse, resulting in the occurrence of single channel irregularity.