Chalcogenide glass is an ideal infrared wave-transparent material, and it has the advantages of low cost, high production efficiency, high glass transition temperature and good mechanical properties, etc.. It is a candidate material for thermal imaging system. The block sample of Ge₃₀Se₇₀ chalcogenide glass was prepared by the method of the melt-quenched. In this work, XRD was used to determine whether the sample was amorphous material. With the DSC thermal analysis method, the glass transition temperature T_g and the initial crystallization temperature T_x of the sample were measured. The dynamics ideal glass transition temperature T₀ of the specimen was fitted by VFT equation. The method of segmented step heating is used to analyze the calorific value for the glass and congruent crystal of Ge₃₀Se₇₀ sample in setting temperature range. Then from the calculated calorific values of the glass and crystalline samples, the specific heat capacity relationships were obtained, i.e., c_p,l=0.0002T+0.3337 and c_p,c=0.00006T+0.4594. The results show that T_g and T₀ of Ge₃₀Se₇₀ sample is 590 and 581 K, respectively. And T_g will increase with the increasing of the heating rate R. The average value of the specific heat capacity of the Ge₃₀Se₇₀ glass sample is about 11.8 J/(molK) below the glass transition temperature. The infrared transmittance is about 60% indicating that the infrared performance is good. The glass reduced temperature T_rg of Ge₃₀Se₇₀ sample is between 0.5~0.667, and the nucleation rate is very low, which indicates that the glass forming ability of Ge₃₀Se₇₀ glass is good.