The midinfrared (MIR) region plays an important role in the fields of environmental monitoring, material processing, surgery and defense. Currently, lowloss highconcentration Er3+doped ZBLAN (Er∶ZBLAN) fiber is one of the main promising gain media for 3 μm MIR laser sources. Er∶ZBLAN fiber lasers have the advantages of being easily integrated, highly efficient and directly diodepumped in comparison to other 3 μmclass lasers. With improving performance, Er∶ZBLAN lasers are expected to reach maturity and commercialized at wavelength of near 3 μm firstly. The working principle and status of Er∶ZBLAN fiber laser were briefly described in this paper, and the existing problems of three different Er∶ZBLAN fiber lasers were analyzed and summarized. Finally, the development trends were also prospected.