Glass ceramics based on mass fraction of 0.6% Ho3+-doped 65GeS2-25Ga2S3-10CsI (in molar fraction) chalcohalide glass are prepared by various heat treatment technique. The densities,micro-hardness,infrared transmission and mid-infrared emission spectra of the samples are measured,and their differences between host glass and glass ceramic are investigated. The results show that the density and micro-hardness markedly increased after heat treatment and further increase with treating duration. X-ray diffraction (XRD) and scanning electron microscope (SEM) measurements indicate that GeS2 phase with grain size of 80 nm are precipitated after treating the host glass at 440 ℃ for 12 h,and the mid-infrared emissions of Ho3+ ions of this glass ceramic sample at 2.0 μm and 2.9 μm are enhanced significantly.