2 μm emission properties of Tm3+ in fluorozirconate glass were reported. The Judd-Ofelt (J-O) intensity parameters Ωt (t=2,4,6),spontaneous emission probability,fluorescence branching ratio,and the radiative lifetime were calculated on the basis of Judd-Ofelt theory by measuring the absorption spectra of the glass. The effects of Tm3+ ion concentration on the optical parameters were discussed. From the measured emission spectra of glass,it was found that the peak wavelength of Tm3+:3F4→3H6 transition is located at 1.82 μm in the Tm3+-doped fluorozirconate glass. It was also found that the cross relaxation (3H4→3F4,3F4→3H6) between the Tm3+ ions occurred with the Tm3+ ion concentration increasing,which leads to the increasing magnitude of 3F4→3H6 transition. Due to the concentration quenching mechanism of three-energy level ions,the intensity of luminescence decreased obviously. The stimulated emission cross section of Tm3+:3F4→3H6 transition was calculated by using Mcumber theory. The results show that doping concentration has little effect on the emission cross section of Tm3+ in the present fluorozirconate glass.